Is there GITS in GIT?

Is there a shell ghost in GIT?

So, someone made a transition from a different time zone, and if so, then:

git diff hiscom~1 hiscom

      

        
        
        
      

    

I get a huge swath of changes as a day of work.

If I do git show hiscom I see multiple lines changed. If I do git show hiscom ~ I see multiple lines changed.

Its commit was in a completely different timezone, 12+ hours before the repo / last commit, then the commit after it was normal again.

Is something broken in the GIT? I managed to go back to the story in 24 hours and find the commit that should have been right in front of it. Its like his team jumped into the future and threw away all changes, like the branch was reset to 24 hours ago. The difference was nowhere to be seen on BitBucket as the git bit bucket shows no git diff hiscom ~ 1 hiscom.

Any suggestions on what to do to keep this from happening in the future?

EDIT: If I do checkout hiscom then do git log. I see the first commit after writing the correct HEAD. But the current leader in his industry hiscom is failing.