Commits in private repository from different user

Hi,

I see in a private project of mine, here on gitlab.com, commits from a different user. Those commits are a couple of years old and I’m quite sure that they can only been made by myself. I looked up this user in gitlab and the one actually registers only a few months ago.
Has anyone an idea was this means? Could it be a security problem?

Cheers,
Wolfgang

It appears that these commits are authored by “hg devnull@localhost”, which is certainly an artifact from my migration from Mercurial on Bitbucket to Gitlab.

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But is it correct that on Gitlab those commits are flagged with the name of someone completely unrelated?

I consider this as at least somewhat strange.

Cheers,
Wolfgang