Dropdown Menu in RTL mode

Hi,
I set my site to use with arabic language by setting ‘dir=”rtl”‘, the problem that I encountered is that ‘dropdown filter menu’ no longer works, when I click on it I get a blank page, and then only by pressing ‘esc’ I can see the menu expanded. When I put back direction to ‘ltr’ things work well. I tried to change direction locally but this didn’t solve the problem.
Here is a link to the page where I encountered the problem.

Anyone could help me to correct this!
Regards