The flange needs to be screwed down to the floor.Use a thick wax ring and you should be fine. Don't tighten the bolts too much, that's what pulled the edges up in the 1st place.
Test flush a few times to confirm wax ring seal, then caulk the base and you should fine.
I’d probably replace that one. I agree, anchor it.The flange needs to be screwed down to the floor.
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