Problem with the font size in Storyline 360

Hi, I have a problem with the font size in Storyline 360. I have to modify a big course that includes about 25 modules. The last time I was doing it was about one year ago. This time when I open a storyline file, I see that font size changed (it is about 0.5-1 size bigger). I am using mostly Open Sans font (size 14), but the same situation is with other fonts (like Relay font). The problem is that text doesn't fit well in boxes/shapes so it requires a lot of work to change it (most slides would have to be modified).
I reinstalled Windows last time (to Windows 10), but I don't think this should cause a problem. I am also using a different Office version but Storyline is not connected in any way with MS Office so I also don't think it should be a reason for a problem.

Do you know what might cause this kind of an issue? How to eventually repair it globally (maybe in settings), so I will not have to modify almost every slide (we have thousands of them)?