Mobile menu slide (BUG)

Hello amazing developer team of JomSom Pro. We have a bug on ipad mini second generation, iphone version 5. I have tested in this devices. So what happen? When you Random click at the menu primary or secondary or refresh sometime the page a slide mobile menu appears at the left and disappear fast in just 1 second. I also removed chache, try a friend to test it on iphone 5 but the bug is here and it's really unconfortable. IT's visible live at www.natureword.com and on the JomSom pro demo page here at catchthemes. You can take a look at screenshot here: https://dl.dropboxusercontent.com/u/7588358/JomSom/JomSom%20Bug.jpg You can take a look at video i have made here: https://youtu.be/bExOnF0BNYU Thank you for Attention. Hope you can do something! Happy new (Nepal) Year!