Problem with next Image button

Hello

I use metaslider and I have big problem.

our language is RTL(right to left) and “>” should be go to next picture and “<” should be go to previous picture !

I change the setting like this:
http://up.vbiran.ir/uploads/3561146827032141346_s1.png

in preview , every thing is OK but in my site, when I click to “>” , it migrate to previous picture

I clean my cash site but problem haven’t solve !

my site url

https://wordpress.org/plugins/ml-slider/