There seems to be a problem with clocks, or have we overlooked a setting? In the teacher's Polypad Dashboard for the activity, on the thumbnails, the students appear to have answers marked correct (and indeed, looking over their shoulders, they did answer correctly). But when that Polypad is opened, either from that thumbnail, or from the Google Classroom submitted assignment, or when the student re-opens it, the minutes are all missing, and the problems thus marked incorrect. It looks like the clocks may be rounding to the hour on submission--or maybe something else is going on?