The problem: you see Sealing to Parents as completed, but no parents are attached to the person. Or you see Sealing to Parents complete without parent names and Sealing to Parents available with the parents you see in the tree. In both cases, there have most likely been changes made to the parent-child relationships. At some point, parents (or different parents) were attached to this person. You can find out. On the person page, find the Latest Changes box on the right and click Show all (unless, of course, you see the parent-child relationship deleted message right there in the box.)
So, what should you do?
- Look for and merge any duplicates you can find in Family Tree (review carefully and only merge if you are SURE).
- Look at the change history to find deleted relationships that can explain the sealing.
If you don't find duplicates, and the existence of the other sealing bothers you (it really shouldn't, but it might), contact FamilySearch Support and they can get a case to the team who can fix it.