Just won a BIN item & had to tell the seller what option (plug) I wanted in checkout. Clicked the buttons, & on the page where the "Send note to seller" box is supposed to be, it wasn't there! I looked over the whole page carefully, even clicked in the space where it was supposed to be, but no "Send note to seller" box, just blank white space. So I continued to the end, checking every page for the ellusive box, but not on those either. So sent the seller a message via "Contact seller" apologising for having to tell them my option that way & why.
I'm getting sick of these glitches, if that's what this is. I can't think of what else it could be.