it shows the maximum number that could be used in "ideal" conditions. Here you have even less materiel to reinforce your troops, the reinforcement process is stopped before all needed personnel could be used.
I'm not sure if it should take that into account, or if it should stay as it is to warn you that even if you manage to get (much) more materiel, there will be a lack of personnel.
I'm not sure if it should take that into account, or if it should stay as it is to warn you that even if you manage to get (much) more materiel, there will be a lack of personnel.