Axie Infinity updated the $AXS token to a new contract back in May 2021. It looks like MetaMask Swap is defaulting to the old AXS token when users are swapping.
New AXS contract: 0xbb0e17ef65f82ab018d8edd776e8dd940327b28b
Old AXS contract: 0xf5d669627376ebd411e34b98f19c868c8aba5ada
Might make sense updating the AXS ticker to the new contract so users get a better price/more liquidity.