Seems that when you use temp powers in someone with sinbin it stills there, I'm not sure if this would happen, since it's a "rank" well?
It's not correct I think based on the wiki it was supposed to only happen to Moderators, not Owners:
"Sinbin will allow an owner or main owner to strip moderator abilities from permanent moderators, from 36 seconds to 24 hours. This power will not work on temporary moderators." - xatwiki
FLASH - HTML5 (Server sided)
2° Use /mo1 (tempown) on their PC