I think you are correct WTN1271, it looks like someone went to install the aftermarket grips without lining up the holes for the grip pin and went at it aggressively with a hammer.

Based upon what I have read in the past, I would caution not to have anyone do any welding on an aluminum frame and suggest you not do anything until hearing some more from some of our very knowledgeable and experienced armorers here on the forum, who will probably be along soon. Also, given this one issue that you noticed, it might be worthwhile doing a complete disassembly, if that is something you are comfortable doing, and carefully visually inspect for any other issues.

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