Hi, try out these steps. They go over the simplest causes to more complicated ones:
Regenerate the CSS via Elementor > Tools > Regenerate CSS on your WordPress Dashboard.
Go to Elementor > Settings on your WordPress dashboard.
Click the Advanced tab and then switch the CSS print method to Internal embedding.
Clear all cache: your browser’s cache, other plugins’ cache, server cache (if possible).
To rule out the possibility of a plugin or theme conflict, Enable safe mode and see if it helps.
In case safe mode helps, deactivate your plugins one by one to find the culprit.
If deactivating the plugins didn’t help, switch your theme (temporarily) to a default WordPress theme such as Twenty Twenty One and see if it makes any difference.
Switch the CSS print method back after following these steps, regardless if it helped or not.