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Hi,  I manage a person's dna on ancestry who is related to me on his paternal line.  His grandfather was the fathered by the brother of my great grandfather not who he had thought.  We have many matches proving this.  He has over 700 4th cousin matches .  Many many of them are through his father's mother's line.  They keep showing as maternal.  I know I can change them to paternal, but there are hundreds of them. I have put the matches that are also on My heritage onto DNA painter and many of those matches are often in the same place as my link to him and the others I know are through his father's line.  His actual mother's line has only a handful of matches and none of them are more than 20 cm.  So now I am wondering if he doesn't have another secret lurking in his tree? 
His father's mother shouldn't be showing as maternal unless his mother was actually related to them?  I hate to ask him as he has already had one surprise.  Thanks

Hi again,Thanks for replying.  It seems Henry George Clark got my Great Grandmother pregnant in 1891.  She was working in Oxford but her parents lived in Barford, in Oxfordshire.  Henry was living as a lodger in Woodstock Oxfordshire which is about half way between the two.  My Great Grandmother was Louisa Margetts, she went to Sutton in Surrey to give birth to my Grandfather.  She registered his birth and named him Corrie Enrico Clark Margetts.  She gave him to people called McRae and he became Corrie Enrico McRae.  It is only through dna that we have decided it is him.  His brother came to New Zealand and I have been in contact with DNA matches to his brother.  From what I have found out Henry George Clark inherited his father's business in 1896, and married Olive Annie Berry in 1900.  By 1901 he was bankrupt.  He and Olive had 2 daughters but by 1911 she and the girls are living with her parents.  I can't find Henry anywhere.  In the New Zealand branch's tree, they just have "went to South Africa" against Henry's name.  Does this tie in with your information at all.  Probably no one knows about Louisa and it is the dna matches that have finally after 18 years of trying found Henry.  It seems Louisa did give clues by using Enrico (Henry) and Clark as part of the name she choose. I live in NZ but came here on my OE in 1974.  Bye for now Penny.