Screen door track bent/sticking

A screen door sticking in its track is usually a bent track rail from someone leaning on the door or a gust catching it wrong, not a worn roller. Check the track for visible bends before replacing rollers — a slightly bent aluminum track can often be carefully straightened back with the door removed. If the rollers themselves are worn flat on one side, that's the actual wear item and a cheap replacement. Is the track visibly bent anywhere, or does it look straight?