Connection points on the line are unevenly distributed

I'm trying to create a very basic link sequence diagram in Visio 2013, but the connection points on the life lines are unevenly distributed, making it impossible to create a beautiful diagram. According to many examples found on the internet, the points should be evenly spaced. I just installed Visio, so this is a fresh install.

Does anyone know what is causing this and how to fix it?

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