Hello @pranalipatel,
I do believe the double scroll bar is partially a theme issue. BeTheme uses a customized scroll bar by default, which is called nicescroll. As a fix I have disabled the nicescroll scroll bar and am using the normal scroll bar instead. It makes the page look less pretty but it is better than having a double scroll bar I suppose, and much better than having a page that doesn't scroll in Chrome on a mobile.
The scroll issue is probably a Chrome issue as it only happens in Chrome for mobile.
Thanks!