Hi etalocohc!
Well, chances are, since you bought a cheap keyboard that it is of poor quality, not much you can do if that is the case except buy a better quality keyboard. What make and model is it?
It's also possible that it is a manufacturing default, in which case you should contact customer support or take it back to where you bought to have it sorted out.
Unfortunately keyboards can be an expensive and confusing(in the beginning) activity
Keep us updated what the situation is and I'm sure someone on the forums can help out.