Model contributors show non-existent user

Hi everyone.

Forgive me if it’s a stupid question. I just found the model I uploaded shows 2 contributors while there was only me all the time. The most recent update of the model card is also done by me, but shown to be done by “kou”, which is in gray and unclickable. (Though I couldn’t recall it precisely, ‘kou’ might be the full name I set at that time).

I am wondering why this is happening.