Question about Comfortmaker EDM4X48FA 4 Ton Cased Multi-Position Evaporator Coil

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Rattling sound on the outside fan of a Comfortmaker high efficiency heat pump

Comfortmaker high efficiency heat pump makes an intermittent rattling sound in the outside component. I took the top off to expose the fan and saw where the outside edges of both blades of the fan are slightly damaged. It must be rubbing against the outside casing but I could not see where it's rubbing. I bent the blades very slightly at the edges and the rattling stopped. Is this a common problem? Does it matter if I bent the edges of the blades a tiny bit?

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