Hi Sandy,
The data (table of names and dates) in the GEDCOMpare report comes directly from your GEDCOM file that was uploaded. So "Unknown Osborne" is listed as an entry/person in whichever system you downloaded the GEDCOM from originally.
It is possible that is was created as a placeholder for a relationship and not something you created yourself. The best advice I can give you is - do not match or add that profile.
GEDCOMpare can be confusing the first time you start interacting with it, so I took a look over your report and it appears that you have a couple errors in the matches so far.
For example, on row #7 you have a man named John, born in Kentucky, matched to a WikiTree profile of a man named Thomas, born in Cardiff, Wales. The spouse and children do not match. This match should be removed.
There are similar error in rows #17 - the person from your GEDCOM is matched to an incorrect WikiTree profile (they both represent different people).
If you need any help, please: