Do you wanna say to compare the tx fees on NFTX with your chainlink? It should be caused by the calculation based on the amount of token combined with the price of the token.
Remember this if the exchange site didn't wanna calculate based on the network fees equally but the exchange site was charging the fees based on how many tokens that already determined as withdrawal fees. that's why it could be more than the standard fees on blockchain.

It seems like the exchange site is not yet adjusting the fees for NFTX.