Anton There could be many reasons. First the question, how do you know you won a block?
So even if you find a proof there still can be error coming after that, that will make the proof invalid.
- Invalid proof of space
- Received proof of space for an unknown...
- Too many blocks added...
- And coupe more
Pretty much the only sure way to check for won blocks is to search for "Farmed unfinished_block"
There is also other possibility, could be that your rewards go to different wallet: