Why Google reports those mobile site errors

Hello

Google mobile test tool ( https://search.google.com/test/mobile-friendly ) reports errors on most of the pages of a forum I manage. 

These are the errors:

Content wider than screen
Clickable elements too close together

Example pages:

Content wider than screen :
https://learn-greek-online.com/ask-greek/1308/poli-and-para-poli
https://learn-greek-online.com/ask-greek/1264/how-to-say-its-me-on-the-phone

Clickable elements too close together :
https://learn-greek-online.com/ask-greek/531/isos-kai-mallon-are-they-the-same

Especially this error puzles me, since I do not see any horizontal scroll bar on mobile screens.

There are some pages that no errors are reported:

https://learn-greek-online.com/ask-greek/1269/what-is-the-biggest-characteristic-of-greek-vocabulary

https://i.ibb.co/5BYr2JC/p1.png
https://i.ibb.co/y89wvQL/p2.png