Issue with the menu

Hi there!
I have a little issue with the menu bar.
When i’m hover the menu that has a sub-menu, it disappears suddenly and also the language switcher. So to click in a sub-menu you have to try to have luck to do it.
Only happen in the pages where a fixed widget is.

Thank you in advance!

https://wordpress.org/plugins/q2w3-fixed-widget/