Thank you for your post.
What version of FileMaker Pro are you using? What operating system and version?
I cannot reproduce the issue using FileMaker Pro Advanced 15.0.2 under macOS Sierra 10.12.2. Please provide more detail about the Styles, padding, etc. so I can reproduce the issue.
El Capitan v10.11.6
FileMaker Advanced v220.127.116.11
I received your file. Thank you.
I am able to reproduce the issue with your chart. However, if I create a new chart with the same settings, fonts and styles, the issue doesn't occur. Therefore, your chart is damaged and should be replaced.