Hi @vangelov
This isnt only for you. I transferred today SBD from my steemit account to poloniex and it still doesnt appear on my poloniex wallet. I guess this is a general issue because some other people have the same issue. And maybe this is because of hardfork. I have created a ticket but I know that they will response after 1-2 days or maybe later.
Don't bother waiting foe the ticket to be reviewed, they will tell you just check your transfer history and you will have to wait for another reply, prob a week or so..
It's really annoying and my friend said that he had the same problem during the last hardfork 18 and maybe this is because of hardfork. Today I saw many posts with the same problem. I guess it will be fine after the hardfork.