Quip not saving comments - no comments in backend

Hello,
I tried to find a solution on variable forums, but any chance to find something.
I have Revo 2.0.8 and latest quip 2.0.0. When I use the basic form for reply ( QuipReply? &thread=`someName` ) the comments are not saving. I had a lookup in database and there are no comments, the same in quip manager. So there’s some problem with saving it to DB. I had this problem on another sites, so I made clear install and tried it there and get the same result.
Can you help me, please?
Thanks