Question TextMeshPro acts weird when it gets updated at runtime

Hello,

I'm struggling with this very minor, although noticeable thing. One of my texts, which is getting updated at runtime, will at random include small chops of different characters, as seen below (first or second six has an extra unnecessary line).

Font is quite small compared to others, as the font size is 36 when others are 70+ in the scene.
This text is also included in a different scene with same settings, but it's not updated and does not get this 'choppy'.
So far I've tried to increase padding on font atlas, change the size of font atlas and use option 'Extra padding' in Extra settings to try and fix it but it still happens.
Does anybody have an idea on how to prevent this from happening?

Thanks for suggestions in advance.