I uploaded 4 GEDCOM files, one for ancestors of each grandparent as was suggested, but for some reason even though the first one was supposed to be for my father's side of the family, tons of info from my mother's side got uploaded too.
My main problem is that the Compare page needs to be redesigned to have a column for whether or not someone is an unskipped match, or else the merge program needs to provide a list of the ones its complaining about.
But even if they were identified, I don't think that would solve my problem. Many times I'll have tons of info on someone that is a definite match for someone that's in there already, but they've just got, for example, the name and birth date. I don't want to skip mine and use theirs, because mine is better.
Another problem is that all of our info will match except they'll have a different mother, or a different death location. Who's right? I don't want to skip mine and use theirs if it's wrong.
If I could just have the website show me which matches are unskipped, just so that I wouldn't have wasted a full day yesterday, I would mark each of those as not being a match. I would HATE to do that, but I would hate losing the whole day even more.
If this site is really interested in having correct data, then they have to provide a way for us to give it to them.