Why is my filter creating bubbles and sticking to the side of my tank?

what kind of fish do you have? what are your tank parameters? what other critters do you have in your tank? with out knowing this information I would guess that one of your parameters are off and a water change is in order.

with this info I would look at your ammonia and chlorine levels both are toxic to fish and can cause the kind of bubbles I understand you to be suffering from. if ammonia is the issue i would recommend a large water change 50% to 80% and treating tank with a water conditioner. If it is chlorine I would recommend a dechlorinating water conditioner as treatment.