The incremental code quality report from Checkstyle is not taking effect

On GitLab, I’m using Checkstyle to generate incremental code quality reports. However, every time I merge the code, the quality report on the page shows no change, despite confirming that the code changes I made resulted in a decrease in quality. Why is this happening? Can you please help?

Use the private Windows to see the changes occur, sometime cache can do this type to issue.