NFTX is unable to unwide the SLP position as part of the unstake liquidity process, so you may find yourself left with SLP tokens.
The SLP tokens are a claim on the ETH and vTokens you have on SushiSwap.
To unwind the position you can go directly to https://app.sushi.com/legacy/remove/ETH/<vToken>?chainId=1 where <vToken> is the vault address/token.
You can get this by checking the info tab on the vault, or by copying it from the URL on the vault page.
