So I decide that I'm on wrong chain, I delete all related with WOWNERO, started to download blockchain from the beginning and again the same - Height: 53666/53666 (100.0%) on mainnet.
Did it twice. Nothing helps.
wow the f*ck is this ?

Update your daemon & wallet. You need to be running v0.3.x ... the network hard-forked at block 53666.
And while I'm here, I may as well note that our pool is on the updated software for anyone interested in mining Wownero:
https://cryptonote.social/wow