I have no idea about Yobit and can't speak for them. What I can tell you is that many people have reported that when they send PWR coins to Yobit they confirm and show in the block explorer and then never appear in the Yobit wallet. Also, many have reported submitting tickets on this and have not gotten any response from support.

You can follow some discussion on this here at Bitcointalk if you visit https://bitcointalk.org/index.php?topic=1378867.3003

If you need to buy or sell PWR coin I would recommend you take advantage of the new exchange listing that I just paid for at https://cryptohub.online/market/PWR/