'git guilt @~ @' is sometimes not working correctely

[Former user]

The output of

git guilt @~ @

in my case is something like:

• User A ++++++

• User B +++

• User C +

• User D ----------

How could there be more than one user having a + row?

Although the commit has been done by a single person, I have about 40 users in the + row in the original repository. It's a normal commit, the previous commit is a merge commit but without any changes (no merge conflicts).

Unfortunately I can't reproduce the error on a simple repository. Since the original repo is really big, even if you shallow clone it, I just add the github comparing link here: https://github.com/Catrobat/Catroid/compare/fc34290...3d9fdfb