Why AI Code Review Tools Keep Commenting on Lines That Don’t Exist

📰 Dev.to · shy The

Learn why AI code review tools comment on non-existent lines and how to address this issue, improving code review accuracy

intermediate Published 1 Jun 2026

Action Steps

Investigate AI code review tool configurations to identify potential issues
Analyze the training data used by the AI model to detect biases or inaccuracies
Test and fine-tune the AI model with diverse code samples to improve its accuracy
Implement a feedback loop to correct and update the AI model's knowledge base
Compare the performance of different AI code review tools to select the most effective one

Who Needs to Know This

Software engineers and DevOps teams can benefit from understanding the limitations of AI code review tools and how to fine-tune them for better performance

Key Insight

💡 AI code review tools can be inaccurate due to limitations in their training data or configurations, and fine-tuning them with diverse code samples can improve their performance

Key Takeaways

Learn why AI code review tools comment on non-existent lines and how to address this issue, improving code review accuracy

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Title: Why AI Code Review Tools Keep Commenting on Lines That Don’t Exist

URL Source: https://dev.to/shy_the_a91bfb236d4eeb5bb/why-ai-code-review-tools-keep-commenting-on-lines-that-dont-exist-ald

Published Time: 2026-06-01T11:51:51Z

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Posted on Jun 1

# Why AI Code Review Tools Keep Commenting on Lines That Don’t Exist

[#ai](https://dev.to/t/ai)[#llm](https://dev.to/t/llm)[#softwareengineering](https://dev.to/t/softwareengineering)[#tooling](https://dev.to/t/tooling)

While experimenting with AI-powered code review systems, I kept running into a strange problem.

The model would generate a perfectly reasonable review comment.

The code issue was real.

The explanation made sense.

But the comment was attached to a line that didn’t exist in the pull request.

At first, I assumed this was just another example of LLM hallucination.

After digging deeper, I found something more

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Why AI Code Review Tools Keep Commenting on Lines That Don’t Exist

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