So there is an issue with the tipping system? If it is the case, poorbot or any other exchange bot can do nothing except waiting for the site to solve the issue.
If I have to speculate since you dont give clear information about the issue, maybe poorbot has not received the tip in their account so they cant give you the fund back in other coin.
My other speculation is that you have not filled the form, but if it is the case then you should have received refund as the terms of poorbot.
So I think the my first speculation is the case, I dont visit Stake for several days already so I dont know if there is such an issue with the tipping feature.