First thought is debris and/or gunk under the ejector star. It could also be the ejector rod or even the center pin. If the rod is unscrewing, that will tie up the cylinder. If someone replaced the rod, it could be too long and the same goes for the center pin. Also, a bur or crushed end on the ejector rod can create enough friction against the front locking bolt to bind the cylinder. Beyond this and the things mentioned in previous posts, a serious mismatch between the ratchet and hand is possible if one of those parts was damaged and/or replaced.

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VCDL, GOA, NRA