Do NOT try to remove the patch--it will tear the liner. You CAN work glue under edges that are loose, but don't yank. Instead, though, you need to put a much larger patch to put over it. If you have a piece of liner you can use that and it won't show as much. You want rounded edges, and you want to put the glue on the patch while it's dry.

If you have sand underneath, the leak can be devastating to the sand. A GOOD installer (sigh... ) will repair that sand so the the new liner is, well, like new...