Kicked character rejoined

I kicked a character from the guild yesterday and today he rejoined, but there is no invitation in the audit log. Did this happen to anyone else? Also, wtf happened to WoW support? I am unable to find a suitable category to open a ticket in for this.

Not sure how the log works to be honest, I use an addon GRM but quite often it comes up “Invited by Unknown”.

Not sure why this needs a ticket though, you can just kick him again surely?