Problem with the menu of the site after upgrading to PageBuilder 2.4.25

Hello. I installed PageBuilder 2.4.25 version and since then, when I access a page that I have built with PageBuilder I see it fine, but after that when I go to the same submenu and try to access another page, the mouse automatically selects all the submenu choices. I disactivated the PageBuilder plugin and the menu works fine. I activated it again and disactivated other plugins. Finally I found that there is a coflict with the Huge-IT Gallery plugin since I upgraded to version 2.1.4. What can I do?
You can check this on http://5sek-acharn.att.sch.gr. You can use the english flag at the top and then go to the option Studies–> Specialties(3d grade)–>IT–>Tecnical Computer Applications and then go to the menu Studies again.
Many thanks for your help!