I’m not understanding GAS prices.

I have a Trezor, and I want to move some ERC20 to a hidden wallet. I don't care how long it takes, I just don't want to pay more than say $3. I see now on gasnow, the fees are low (~$0.67 at 12 GWEI).

But when I go into the Trezor to send it, the app tells me the fee is $6.36 on the normal setting. If I change to CUSTOM, this is where I get confused.

It won't let me change the GAS LIMIT down to 61,000 which I read is the lowest for ERC20. It requires it at 200,000. To get under $3, I have to set the gas price to 5 GWEI but that is much lower than the current fees.

What is going on? Why are my fees still so much higher than the current fees?

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Sorry to sound like a noob! Thank you.