That isn't an Electrum fee. If you sent FROM Paxful TO Electrum, then the transfer fee you see is what Paxful paid to send the BTC to your Electrum wallet.
If you look up the transaction on a block explorer like
https://blockchain.info you will no doubt see that Paxful "batch" up payments... and have spent that fee not just on YOUR transfer, but on sending BTC to a LOT of people all at once.
Although, something is wrong if Electrum says -$26... it shouldn't care what the transaction fee for an INCOMING transaction is.