Custom Token Transaction Before Gas Fee Option "Next" Button Is Greyed Out

Hello, I was about to send out some SLP (Smooth Love Potion) to Binance. I have about 5909 SLP in my Metamask wallet, but when clicking the maximum SLP for transaction the “next” button Is greyed out. Tried typing 5910 SLP and it says it has insufficient funds so it still reads my SLP correctly but still the " next" button is greyed out. I can’t seem to go to the next step which is choosing the gas fee price, any suggestions why this happens or is it a bug on the Metamask platform? thanks!