Whooee, som'un got up on the wrong side of the bed, stubbed his toe and had to drink cold coffee this morning.
Dump the magazine in a can of fuel oil or oil and let it soak for a bit. Then grab something to use like a plunger and push down on the follower to make sure it isn't grabbing on the sides or hanging up anywhere. A few cycles should free up any glitches if there are any. Blow it out with a compressor and use a solvent like a can of spray carburetor cleaner to clean the oil out and you most likely will be good to go. If you still have problems time to open up the magazine for a closer look. Stiffness isn't a malfunction but sticking is and not being able top load the magazine to capacity is. Keep in mind some magazines are a bit optimistic on how many rounds they say you can load and will be a round short. Live with it if the the magazine is otherwise functional.
Good intentions will always be pleaded for any assumption of power. The Constitution was made to guard the people against the dangers of good intentions. There are men in all ages who mean to govern will, but they mean to govern. They promise to be good masters, but they mean to be masters.