Alright, I solved the problem and just wanted to explain what was going on in case anyone else has the same issue and comes around looking for help.
I have new dual-band Airport Expresses expanding the 5ghz network, but they decided to expand it at 2.4 ghz on an automatic channel. My devices were connecting to the stronger 2.4ghz signal that still had the 5ghz network name. And there is no option to change this in the Airport Express setup. It's definitely something that should be fixed, but for the time being I just changed the Expresses to extend the 2.4ghz network and the 5ghz network is left short range and only from the extreme base station -- but at least it is only 5ghz.