hi guys i have a 2 or 3 person tube that the inner tube or bladder whatever u call it just doeasnt fit well in the tube cover . Ive tried readjusting and moving the inner tube around but it folds near one end so when i inflate it it looks all deformed. Is it possible the inner tube got bigger or the outer cover shrunk ? ive had tons of tubes in the past easy peasy, but this thing is driving me nuts.. i even took out the darn inner tube and fully inflated it and placed the cover over it and matches perfectly? but wheb i put it back it just seems to big for the cover