DNA Puzzle

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My second daughter has now had her DNA analysed on Ancestry.

We are getting quite a group now - 2 of my daughters (F and B) and my niece (R), my dad (L), my first cousin (P). My husband's two sisters (LM and BT) are also there.

On GEDmatch, we have me and my husband, his sisters and an aunt, and my girls.

The little puzzle is both my girls (F and B) have a small 8cM match with a man (MR). Ancestry is suggesting common ancestors in two of their 5xg grandparents who lived in Wokingham Berkshire, William Chaplin and Mary Trumplett.

But MR does not share any DNA with my Dad (L) or my cousin (P), or their cousin (R). Nor with any of the other 30 or so descendants of the family in Australia who have Ancestry DNA profiles.

So I thought the match might be through my husbands family who also lived in Wokingham, but there is no match with LM or BT. Nor with any of the many Langley family DNA samples on Ancestry.

But if my Dad has no common DNA with MR, then how did F and B get it from William Chaplin and Mary Trumplett?

Have I misunderstood how DNA works? You can only get DNA from your ancestors through your two parents and four grandparents. You can't randomly get 8cM outside of what your parents (or grandparents) have.

I have to say that the connection is not made in MR's tree, but by those connections that Ancestry makes through several other trees. The connection does seem feasible, but the DNA results don't gell.

I guess I am off to research through the records and chase down the connection.