Lots of themes here have settings tabs - try Customizr as it's very widely used:
https://wordpress.org/themes/customizr/
Thought anyone who faced similar problems here could help me.
Possibly, but it sounds fairly theme-specific - in which case, the developer would be the best one to help you.
You could also try checking for errors:
https://codex.wordpress.org/Debugging_in_WordPress
https://codex.wordpress.org/Using_Your_Browser_to_Diagnose_JavaScript_Errors