As CACycling says, it's most likely ruined, particularly if this is a square-taper crank. They require a LOT of torque to seat correctly, and if you're not using a torque wrench or have never installed one before, you're probably using nowhere near enough force. And once you have a ( new ) one on, don't try to go back periodically and tighten things up again, because that's also another way of ensuring you'll end up needing a new crank sooner rather than later.