SourceTree Git graph merge issue

[yamsellem]

Hi,

SourceTree 2.0.4 has an issue regarding git graph.
Looking at the following graph, we can see six 'Merge branch dev' instead of a succession of commit and merge. 
The commit dates are a good help to imagine the proper order.

By the way, the graph is pretty amazing.
I've believed living in New York City for a minute . 

Thanks for your help.

Capture d’écran 2015-01-09 à 16.32.38.png

[Seth · Accepted solution]

Above the graph, chose "Date Order" instead of "Ancestor Order".

[yamsellem]

This works fine. What is the difference between the two orders, and why 'Ancestor' is default?