Checking out some JavaScript code on the main add cart payment and checkout page. The older code was only looking for one submit button. We recently redid the page and added in a second submit button. The old code would enable and disable the button if a user tried to use too much on the loyalty program. With the new page having two buttons, it would disable the submit button, thus letting the loyalty points go negative. Small oversight. Basically, the page with two submit buttons worked in every other situation, it just didn't take into consideration the over allotment of loyalty points. Lots of edge case scenarios. It's hard to test for every possible combination. Anyways, we got it fixed.