It's the # of blood related strings in the connections. (you are 19 degrees connected). Sometimes the branches/numbers show up for me, sometimes they don't...
2 - the person you are connecting to, and someone related to them (parent, sibling, child)
7 - the first of the 7 will be spouse of the (parent, sibling, child) then the rest will be various connections.
10 - again, the first will be spouse of the last of the connections in the last group, then the rest are blood connections to you.
(and switch the directions if the 2 group includes you.)
