they will EVENTUALLY move, but sometimes 30 out 0f 40 men will stand around, especially if you halt them to charge a new enemy, like i said it happens to a greater or lesser degree, but when i need my last unit of vangrian guard to form up and move now or else i'm the one about to get routed it sticks in my memory

maybe you dont notice it as much but if your paying attention and use mostly infantry based armies like me it happens alot, i rely on those shock infantry, english knights, vangrians etc