They are mites.
Until you have numbers to compare, and figure out if the mite counts are going up, going down, or maintaining, numbers are just numbers.
I would be concerned about the excessive amounts of wax on the sticky board after 24 hours as you indicated. This could be a sign or robbing (but you should know it, so it probably is not) or even the fact that they may be burning through their own honey stores. Wax usually does not accumulate in pieces without a reason.
This year, we are not really having a "dearth" period as with other years. So the natural brood break, and the associated mite break, may not be seen or benefitted from. I have hives that are raising brood right through summer while others have slowed down, and are starting again with the early goldenrod. The early goldenrod normally does not give much nectar (normally too dry), but this year with all the rain, there must be ample nectar as the bees are all over it.
Too many things happen within the hive that can effect a mite count on a single count. Brood stoppage, first cycle mite overload from the first series of brood raised after a stoppage, and even cleaning out of drone brood as they evict and stop drone production, are but a few. You should not focus on what happens on one day within the hive, but know whats happening from one week or one month to the next.