You are getting credited with the bonus points. Look here:
charloz24 - User Summary - EXTREME Overclocking Folding @ Home Stats
You can see that in the updates where you only had one uploaded workunit, the amount of points you received were much higher than the base points value of each workunit. I suspect that the reason you're seeing less points is just because you have been using your PC, and the amount of CPU cycles you're taking away from F@H is lowering your points output. Anyway, there's not much you can do about it, short of not using your PC any more, which isn't a solution.