I'm going to suggest the strain has worn on them - they're all presenting in ways they haven't in the past. The adults were all stressed-out, hostile and weird. Based on what
@barkley says about the Las Vegas houses, things must have gotten much, much worse than they were when these first two episodes were filmed. At that time, presumably September of 2018, they were predicting a worst-case-scenario of the houses not selling until early 2019. They even said having to carry them that long would "break" them. Again, as before over the past years, there's nobody working at a readily apparent job in Flagstaff, and we gleaned their TLC payments for the show have gone way, way down from where they were originally.
I also wonder what you all think about what happened to Meri in Flagstaff. Personally, I'm appalled. The idea that one can basically be run out of the neighbourhood, with police involvement and all, simply on the strength of the neighbours not "liking the idea"? Outrageous. I guess I'm a little confused as to whether or not polygamy is actually illegal in the US or is it just a moral issue? If it's the latter and this was some other identifiable group based on race, religion or sexual identity, would there not be hell to pay? And why they rolled over so easily to the landlord breaching the rental contract, I totally don't understand. I get not being comfortable in such a hostile environment and leaving for their own well-being, but I do wonder if they received any compensation from the landlord?