[lch]

Have a look at the resources that the province provides and how much your units cost. You're probably in the negatives because the province doesn't provide enough resources per turn to produce the units you queued. You can notice that if your units appear transparent in the recruitment screen.

About some commanders/units not moving with the others, they probably have difficulty with the terrain (mixing flying squads with non-fliers) or are slower than the others. If you have even one unit with mapmove 1 in a bunch of mapmove 2 guys (which is the standard for most nationals) then those won't move when at all when combined in a group with other squads which all have mapmove 2 and you decide to move them 2 provinces across. The squad with the mapmove 1 units will stay in the province with "Defend", while the others move.