This may very likely be my fault... O:-)
Seems fine in FF but I can reproduce this in Chrome .... seems related to the font weight, at least resetting that makes it act normally.
I'll take a look at it. I have an idea of what is going one there.
Fixed here:
https://github.com/emanuele45/Dialogo/commit/2268f073e2a87431c5d1de9910b0f2a43459875a