I have this one hive that seems a little off. There's just a bunch of minor weird things going on, which each on it's own wouldn't bother me much, but all together it has me a little concerned. I was planning on requeening this hive this spring because they became a little too hot for me during the fall dearth last year. But this spring the queen's brood pattern was so good, I decided to give them another chance. They were building up fast until 2 weeks ago when I inspected and there were no eggs or open brood in the bottom box, just capped brood and empty comb, but the next 2 brood boxes looked normal. I noticed some greasy/hairless bees in the hive, and they suddenly weren't drawing fast and their population was either the same or lower than the previous week. I inspected them again today and it was much the same. The bottom box is now almost all drawn blanks with a little pollen and capped brood scattered about. The 2nd box was wall to wall capped brood, not a cell missed, gorgeous pattern. In box 3 there was more nice capped brood, some eggs and just hatched larvae, but very little older larvae, although the ones that were there looked fine to my eye. The population is either the same or lower than last week, and they are still drawing their super, but very slowly. The other thing I noticed today was that the hive smelled a little weird, kind of like off, old, dark comb. Their spring varroa check wasn't bad, but it wasn't great, so I'm going to treat them tomorrow with FormicPro, which will hopefully rule out mites and knock down any sick bees. It's not like the hive looks horrible, but something in there just isn't quite right. Any ideas what could be going on?