It seems to me at least with the striker that if you start out as the striker the debuff for (at least) the health does not take affect as if you changed class to striker in game. What I mean is, I've noticed that if I start out as striker my health stays at 15 which is normal and not the -3 from the class. If I change to striker in game then the health goes to 12. I have a feeling that if this is the case with one debuff it might be the case with others/all of them. I haven't tested out any others but just noticed this one. This issue causes obvious balance problems and should be fixed.
After playing more games it seems like this only happens with the strikers health. This bug needs to be fixed so that strikers properly lose 3 health at start of game.