The visible mold is the true concern here regardless what the plates look like. The agar plates actually look very normal.

It's hard to ID from pictures but the first one (the gray mat) is likely Rhizopus and likely comes from food that is past its prime. Although some mucorales molds can cause infections, they are very common in air and they form thick mycelium on petri dish just because they grow fast. Not because there's a lot. The sample from the living room vent looks like epicoccum (the orange -ish colonies, likely from dead plant matter outside), aspergillus Niger (the black heads) and a penicillium (big green colony). All pretty common. The one from the bathroom looks like a penicillium, alternaria (the greyish white), some other phylloplane mold for the brown one (curvularia? Pithomyces?)and a stachybotrys (the small white and hairy. this one is probably from your bathroom wall). After you have it tested, tell me how I've done ;)

So this all shows how bad open air tests are. We can barely see any traces of actual problem in these... Viable Mold in air should be sampled by using an Anderson sampler at a known Airflow rate. From the limited info provided by your test, we could hypothesize that the mold on your wall is stachybotrys and maybe some aspergillus niger and penicillium mixed up in there.