Funny thing. I have 3 monitors connected [dell small] [iMac] [dell large]. When ever I restart my Mac in the morning the two dell monitors switch spaes (3-3) … I have no idea why.
Maybe deleting all spaces and recreate them with all the different apps connected to the different spaces (3 on each monitor) will help – maybea total reinstall …
Best,
DeFliGra