I've seen groups of bachelor bucks like that before, pre rut. Last fall I had 3 come in but no shot, a shooter 6-8 pt, and two forkies. Early bowseason, no velvet. I've also seen summer velvet bucks in ag fields, beans, peas.
I've also seen multiple bucks running a hot doe, I figure the first doe in the area to come "in".
Likely a cover and terrain thing. Bucks like dense cover, tough terrain for bedding, , more so than does (I think) These types of spots draw bucks, and they get to chumming around together, using same, safe travel routes, etc.