Why is the AI stacking multiple armies like this?

grimgor has 30+ settlements and vlad currently has around 12 but they are just stacking their armies in specific places and not doing anything. vlad is a little more active but grimgor hasn't moved in 10 turns since he conquered the entirety of the badlands. have i unintentionally bricked the ai? really enjoying my eltharion campaign atm as its the first time ive actually survived this long...

also khalida is just doing absolutely nothing and shes been like that ever since i discovered her :(