yeah but that it ain't follow the orders exactly is normal, am i right that your SG have no backup? In this case it could happen easily that players without orders get substitutes, if they with you in this trip no matter if you don't list them as backup. That are free to select players, which the coach use to give someone a break.
Your PG play 21 minutes as a starter, because he get foul trouble in Quarter 2 and you blow out your enemy, so that he miss most of 2cd and 4th quarter.
Thats how the bug looks for me, thats why i even wanted this thread open to ask you that and if i'm right there is no bug. And there are some tricks to avoid it(without the fol out thing, which is probadly hard to avoid)