Hi Adriana, the profiles will need to be merged. The recommended way to fix this would have been to change the Last Name at Birth (LNAB) (see here), but it's too late for that now.
I see you've added an unmerged match. You will need to remove the unmerged match then merge Belcher-3282 into Muckley-50. You can initiate a merge here.
At this stage, the only source you've added is a link to a user-contributed family tree on FamilySearch. It would help the other profile manager, and anyone else researching this family, if you added a source to confirm her correct LNAB was Muckley. If I was working on this, I would add the source for her son's baptism, her marriage, the 1851 census and anything else showing her Muckley connection.
I hope that helps :)