Default Can only apply one effect to a photo?

Can this seriously be true? Once I apply an effect, say a sticker, to a photo in the edit mode, that is all I can do. My only option is to save the photo or cancel. If I try to go to the saved photo to apply more effects/filters it says duo effects unavailable for this image. This HAS to be a bug right? Surely we should be able to do more than one thing to a photo! Just another disappointing aspect of an already disappointing camera. Also where's the photo collage function? CMON HTC!?