revolution slider not full screen on mobile

Hi,

I have a small problem with the revolution slider. I have a page with a full screen revolution slider. I used the increase/decrease full screen option to subtract the header from the full height. It works perfectly 95% of the time expect when the width is lower then 316 or between 768 & 784.
then i get a small white space at the top & the bottom.

Any ideas why this is happening?

Can i share a link privately ?

Ticket