Bucks live in bachelor groups throughout the year and once breading gets closer the disperse and split up. Also food sources change through the season and they change habits based on that too. Whitetail bucks anyway. Also hunting pressure, depending where you are, will change their patterns too.
YEP. I'm in SW WI and I see this every year. Depending on buck/doe ratio can be more distinct. My theory for the last 40 years is it is the "calming" or a rest period as bucks have a rush of testosterone as the early part of rut begins. We just had a two week low of pics on the cameras, my water tanks (50 gallon) were lasting 2-3 weeks, and no mature bucks in most of my plots. Then flip the switch and its pics dang near 24/7, water tanks are only lasting 4ish days, and bucks are showing up day and night - plus different bucks I haven't seen.
I wouldn't worry at all about it and know its time for rut activity to begin