You also have to take into account the confidence level. Duplicate matches with 95% confidence should raise an eyebrow, but not as much with the very low confidence ones. They could be some shared IBS segments which are causing these to appear.
Again, if ancestry is listening, without a way for us to know why you think something is a match, you are going to get speculations like this. It doesn't need to be a fancy graphical chromosome browser - just a list of the matching segments is enough.