GIT wants to commit unchanged files on OSX

After closing a project and opening it up again later, GIT marks seemingly random files as being changed and then wants to commit them.
I am 100% positive I did not change these files. It happens on multiple projects. In the example I show a screenshot of files in a Typo3 project, though this happens on other (non-typo3) projects as well.

I never had this issue with other eclipse GIT plugins on comparable code.

Included is a screenshot of the commit window, which seems to detect no difference in file content.