Submenu doesn't work after resizing

ON my site if you mouseover the Solution button in the menu, you’ll see a submenu.
If you decrease the width of the browser it makes the menu disappear, and then you increase the width of the browser to make the menu appear
If you mouseover the Solution button, the submenu is not here !!!
Looking at the inspector I see that a display: none propertie has been added inline to the <ul class=“sub-menu” …> tag. Unchecking this propertie make the submenu working good …
I suppose that a display: block should be added somewhere when going back to the large width ?
Thx for help.

Hello there,

Thank you for getting in touch.

To fix the issue could you please try to add the following CSS code?

@media only screen and (min-width: 1025px){
  #mainnav .sub-menu{
    display: block !important;

You can use the Simple Custom CSS plugin to insert that code through your site admin.

Warmest regards,