Post tiles breaks top navigation drop downs

Hey,

I’m experiencing some difficulties getting Post Tiles to work with my top navigation drop downs. When it’s deactivated, the drop downs work fine; when it’s activated, I try to scroll down to choose an option in the navigation and it immediately closes all together.

Any tips would be greatly appreciated.

http://new.atenveldt.org/

https://wordpress.org/plugins/post-tiles/