Bug in displaying icons (Elementor, My Cred, Jetpack), and a general malfunction

Hello there, I have the platform installed in several websites, but in some of them it is not working properly. For example in my website https://ita.mat-academy.com/learning/ and https://bwstw.com/learning/ in the backend, icons are not showing properly for elmentor, mycred, wp-rocket jetpack and some other, and from them I noticed that I can't add a page through elementor (and form there save global typography for example), jetpack sometimes crashed, the system doesn't send emails, and I need it working for the helpdesk, since I can't be notified when someone writes a comment or writes a new topic in the forum. I can't even edit the widgets area, therefore can't change what students see or don't see. Can you please check? I'll leave admin credentials in the first comment. Thanks in advance.