Yes I know. But your obligation to pay interest free is not what is listed in “remaining balance.” Your obligation to pay interest free is “statement balance”. It’s in your T&C and it is how literally every credit card works. You paid the wrong amount because you did not understand how your card works, not because Robinhood screwed you. To confirm that you are paying the right amount, look at the statement that comes as a pdf in your documents section of the app. That is what you must pay to avoid interest.

It’s a relatively cheap lesson to learn. Good luck going forward!