I think they're feeling the pinch financially. Before I lost the will to live and switched off that GRWM video I did see the bit where she says they're selling their old house which her sister has been renting since they moved to their current house. This suggests to me that the income generated from it wasn't enough to get them out the shit so they've turfed her sister out and put the house up for sale to get their hands on a chunk of money, fast.
I can't get over these influencers buying large houses outright at the peak of their fame. I'd be shitting myself if I were in that position, wondering whether I'd still be popular on youtube in a year's time. Utility bills, property maintenance etc. all adds up quickly even if you don't have a mortgage.