Dangling or missing ancestor view

[md1023]

Please help, I can't figure why branch line goes down vertically and seemingly has no ancestor. I blame two recent merges where origins were merged into same branches and a commit that has merge message but has only one ancestor. I don't know how to fix those commits. Could anyone explain what happens in ungit and maybe how to fix it with git?

'Release' tag is set on master branch commit.

[wmertens]

it's most likely another branch that is painted over the current one. When you hover over the line, I believe it will show you the endpoints. In my #1315 PR there's a lot of effort to avoid this situation.