It looks to be a contribution of a few things I think, with the servers being one of the issues. Also seems clouds are being rendered as an MSL instead of AGL, so for higher elevation airports they are looking foggy, because let’s say the cloud is overcast at 800ft, but the airport elevation is 800ft, then the cloud base is being rendered right at the airport height.
More on that is in this thread here: Are cloud bases in new METAR system in AGL or MSL?
But even so, I find at airports that are at sea level, the cloud depiction and coverage still doesn’t seem to match up with what’s being reported.