Bad behavior toolbar (bold)

Hello, I experience a bad behavior of the toolbar :

I have a bold paragraph, I want to remove that blodness so I select my text, and hit the "B" button in the toolbar. It will unbold a random word or section (randomly), and also reduces the text size. (The behavior is very random, but seems to appear on every text.)

It gets weirder in the "Edit" section, in which nothing happens when I first hit the "B" button first. When I hit the "B" button a second time, an empty space is created at the top of my paragraph...

I never experienced that kind of behavior with Rise before, it seems to be only for the most recent builds.

Thank you!