Menu works but not on child pages

[reasonwebdevelopment]

We use megamenu.js on one of our websites, and it is awesome! I have a problem though which is pretty weird.

It works on all pages except child pages. Once I make the child page a normal page the menu starts working again. I attached some screenshots to show what I mean.

Is this in any way related to this script or is it a problem with wp or oxygenbuilder (the themebuilder I'm using)?

I hope you guys can help me, or point me in the right direction. Thanks!

[reasonwebdevelopment]

Nevermind, on some other child pages everything is fine. So no problems with the script!