I haven't experienced that on the website version -- they give you three suggestions or let you choose any amount -- but noticed my order yesterday was $4 more than it should have been after choosing a custom tip amount. I normally don't double check email receipts for that kind of thing, but maybe it's time to start.
I'm still able to reproduce it on the website today. Trying to add a custom amount magically adds $4 to the order in a way that's not just superficially in the UI. It actually gets added to the order.
I'm still able to reproduce it on the website today. Trying to add a custom amount magically adds $4 to the order in a way that's not just superficially in the UI. It actually gets added to the order.