Cloned repository has file changes -> bug?

Dear all,

I think our git repository is bugged. The reason why I say this is the following. When cloning the repository, the newly cloned repository immediately has file changes. Steps to reproduce and illustration is at the end of this email. Git checkout does not work to remove the file changes. This behavior seems to be reproducible across multiple computers. Is this a bug? How can I fix the repository?

Thanks in advance for the support!

Filip


MacBook-Pro-van-Filip:git filip$ git clone git@github.com:open-ideas/IDEAS.git
Cloning into 'IDEAS'...
remote: Counting objects: 48419, done.
remote: Compressing objects: 100% (198/198), done.
remote: Total 48419 (delta 134), reused 217 (delta 97), pack-reused 48108
Receiving objects: 100% (48419/48419), 42.32 MiB | 1.81 MiB/s, done.
Resolving deltas: 100% (32847/32847), done.
MacBook-Pro-van-Filip:git filip$ cd IDEAS
MacBook-Pro-van-Filip:IDEAS filip$ git status
On branch master
Your branch is up to date with 'origin/master'.

Changes not staged for commit:
  (use "git add <file>..." to update what will be committed)
  (use "git checkout -- <file>..." to discard changes in working directory)

	modified:   IDEAS/Resources/ReferenceResults/Dymola/IDEAS_Fluid_HeatExchangers_GroundHeatExchangers_Borefield_Examples_MultipleBoreholesWithHeatPump.txt
	modified:   IDEAS/Resources/ReferenceResults/Dymola/IDEAS_Utilities_Psychrometrics_Functions_Examples_SaturationPressure.txt

no changes added to commit (use "git add" and/or "git commit -a")