Bep20 token asks for eth fee

Hi, I sent $reef from binance to metamask as a bep20 token. Now when I try to move the tokens out from metamask it’s asking me to pay eth fee. Shouldn’t it use my bep20 token to pay the fee? Or bnc?

Everything was added and sent correctly as a bep20 token. This must be a metamask wallet bug. Could some dev look into it?

Edit: SOLVED: apparently nowadays GWEI not only refers to fractions of eth, but any coin. I just needed BNB.