Very interesting! Do you have thoughts on why?
My simple guess is because they lose their nose advantage. That could be related to beds, scrapes, common doe areas, or food sources.
A lot of buck beds I've found in post season scouting were not necessarily the safest or most secluded spots. Most generally they're positioned to monitor doe activity and travel. Or at least that's the only sense I could make of them. So when I noticed my daylight buck pics were during wind direction change, it made sense that they would have to reposition if indeed they were holing up in spots that allowed them to keep close eye/nose on the girls. I might be way off base on that but it's the only guess I've got so far.