Thank you for posting your feedback here. I can confirm this occurs when:
The branch length is short (as the name of the branch, displayed as a label with some alpha on top, will fit the length of the branch itself)
The branch name is long.
There are several branches forking from the same changeset
I am reporting this issue to the development team.
By now, I would kindly recommend you to consider shorting your branch names (maybe by using an incremental identifier) and type the verbose details in the comments box. You may lose some detail on the branches view, but you will ease the navigation.
Thank you again for your feedback and do not hesitate to contact us in case you find something else.