---
title: "When Personalization Misleads — paper by Sun et al. (2026)"
description: "To counter this, they propose FPPS (Factuality-Preserving Personalized Steering), a lightweight method applied at inference… 36 references."
authors: ["Zhongxiang Sun", "Yi Zhan", "Chenglei Shen", "Weijie Yu", "Xiao Zhang", "Ming He", "Jun Xu"]
year: 2026
venue: "Findings of the Association for Computational Linguistics: ACL 2026"
source: "https://aclanthology.org/2026.findings-acl.395/"
doi: "10.18653/v1/2026.findings-acl.395"
licence: "CC BY 4.0 (ACL Anthology)"
licence_url: "https://creativecommons.org/licenses/by/4.0/"
summary_licence: "Elamur Cosmic License"
canonical: "https://research.elamur.ai/free/en/papers/sun-2026-when-personalization-misleads-understanding-mitigating/"
---
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# When Personalization Misleads: Understanding and Mitigating Hallucinations in Personalized LLMs

**Authors:** [Zhongxiang Sun](https://md.research.elamur.ai/free/en/authors/zhongxiang-sun/), Yi Zhan, Chenglei Shen, [Weijie Yu](https://md.research.elamur.ai/free/en/authors/weijie-yu/), [Xiao Zhang](https://md.research.elamur.ai/free/en/authors/xiao-zhang/), Ming He and [Jun Xu](https://md.research.elamur.ai/free/en/authors/jun-xu/) · **Year:** 2026 · **Venue:** [Findings of the Association for Computational Linguistics: ACL 2026](https://md.research.elamur.ai/free/en/venues/findings/) ([Findings of the Association for Computational Linguistics 2026](https://md.research.elamur.ai/free/en/venues/findings/2026/)) · **Publisher:** [Association for Computational Linguistics](https://md.research.elamur.ai/free/en/publishers/association-for-computational-linguistics/) · **Licence:** [CC BY 4.0 (ACL Anthology)](https://creativecommons.org/licenses/by/4.0/)

**Links:** [Publisher's page](https://aclanthology.org/2026.findings-acl.395/) · [PDF](https://aclanthology.org/2026.findings-acl.395.pdf) · [DOI 10.18653/v1/2026.findings-acl.395](https://doi.org/10.18653/v1/2026.findings-acl.395) · [OpenAlex](https://openalex.org/W7166859670)

**Citations:** 0 citations (OpenAlex, 2026-10-14)

## Summary
The paper examines an overlooked risk of personalized LLMs. When a model is conditioned on a user's chat history or profile, it may answer factual questions in line with what the user said before instead of with the truth. The authors call this failure "personalization-induced hallucination." They attribute it to representational entanglement: the hidden-state shift caused by personalization is not orthogonal to factual directions, so it pulls activations away from correct knowledge.

To counter this, they propose FPPS (Factuality-Preserving Personalized Steering), a lightweight method applied at inference time. It finds layers sensitive to personalization, probes whether factual reasoning is being distorted, and steers representations back toward factuality only when needed. They also release PFQABench, a benchmark that pairs factual and personalized questions within realistic user sessions.

Across several LLM backbones and personalization methods, FPPS raises factual accuracy without hurting personalized answers. This matters because commercial assistants increasingly enable memory features by default. In a simulated teaching setup, personalized models also led to measurably worse knowledge acquisition by learners.

## Key points
- **Representation evidence:** On PFQABench factual QA, hallucinated answers show lower final-layer cosine similarity between personalized and non-personalized responses than truthful answers do (p \< 0.001). This points to a latent distortion rather than random decoding noise.
- **FPPS components:** FPPS combines three modules:
  - a Representation Shift Locator, which finds vulnerable layers;
  - a Factuality Entanglement Prober, which detects distortion from internal activations;
  - an Adaptive Knowledge Steering Module, which intervenes only when needed.
- **FPPS variants:** The method comes in three versions: FPPS-H uses a strict on/off gate, FPPS-S applies graded steering that can push in either direction, and FPPS-M combines the two through adaptive control.
- **Simulated learning:** LLM-simulated "students" learned facts less accurately from personalized teacher models than from standard ones. Adding FPPS-M to the personalized teachers recovered an average of +7.0% learning accuracy.
- **Scope and limits:** The study targets prompting-based personalization, the setup used by ChatGPT Memory, Gemini Personal Context and Claude Memory. FPPS needs access to intermediate activations, so it was tested only on open-weight models and cannot be applied directly to closed APIs.

*Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.*

## Institutions

- [Renmin University of China](https://md.research.elamur.ai/free/en/universities/renmin-university-of-china/) — University, Beijing, China · 114 works · 16,118 citations
- [University of International Business and Economics](https://md.research.elamur.ai/free/en/universities/university-of-international-business-and-economics/) — University, Beijing, China · 7 works · 37 citations

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## Cite

Cite as: Zhongxiang Sun, Yi Zhan, Chenglei Shen, Weijie Yu, Xiao Zhang, Ming He and Jun Xu. 2026. When Personalization Misleads: Understanding and Mitigating Hallucinations in Personalized LLMs. Findings of the Association for Computational Linguistics: ACL 2026.

The paper itself, not this page. BibTeX from the library's record of the work.

```bibtex
@inproceedings{sun2026when,
  title = {{When Personalization Misleads: Understanding and Mitigating Hallucinations in Personalized LLMs}},
  author = {Zhongxiang Sun, Yi Zhan, Chenglei Shen, Weijie Yu, Xiao Zhang, Ming He and Jun Xu},
  booktitle = {Findings of the Association for Computational Linguistics: ACL 2026},
  year = {2026},
  doi = {10.18653/v1/2026.findings-acl.395},
  url = {https://doi.org/10.18653/v1/2026.findings-acl.395}
}
```

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36. Zhaowei Zhang, Fengshuo Bai, Qizhi Chen, Chengdong Ma, Mingzhi Wang, Haoran Sun, Zilong Zheng, 8051 11 Contents \#\# Introduction \#\# Related Work [find](https://scholar.google.com/scholar?q=Zhaowei+Zhang%2C+Fengshuo+Bai%2C+Qizhi+Chen%2C+Chengdong+Ma%2C+Mingzhi+Wang%2C+Haoran+Sun%2C+Zilong+Zheng%2C+8051+11+Contents+%5C%23%5C%23+Introduction+%5C%23%5C%23+Related+Work)

*Updated 1 November 2026*