The Wiki Editor badge is awarded correctly to users the first time they edit a wiki post, but then sporadically awarded multiple times thereafter. Unfortunately I haven’t been able to reliably reproduce it so I don’t know in what specific cases it’s arising. I’ve received it myself multiple times, but do not receive it every time I edit a wiki. Two other users have reported it on our forum as well.
Screenshot from an Italian user:
In terms of the settings, we have enabled the badge and it shows on the public badges page, but no other options are selected (i.e. we have not selected the option to allow for the badge to be granted multiple times).