I don't think anything is wrong with the game.
I'm assuming that at this stage in the game you earned these stars from getting all the secrets in the level, correct?
See the way JK works is that you are normally awarded stars automatically, (ie: you go up in rank) which is every few levels. In addition, you can gain "bonus" stars by getting all the secrets on a given level. In the early stages, your rank is so low that it prevents you from having the mana you need to actually use the powers.
Even if you're so good that you get all the secrets, those stars are more like brownie points for now (later they will help you in the long run though).
So what you end up having to do is basically wait until you go up in rank to use the extra stars and have them actually affect your powers. I know it kind of sucks, but they want you to get a feel for the game (I suppose) before you go flying through with god-like powers. I know the early levels are possible to beat without cheating (and consequently without Force).