Popup not showing when list item is large

I have an apps.in the home page there is list items. which contain around 20 items. I have added pushnav to open popup for corresponding page.

Every page is working well. But one page is not showing the pop properly. Coz item of this page is more than 100. But when I make this item to 20, then it is working well.

NB: When I click on item, it open the pop but not shown. If I click on screen, it works same if pop showed properli.
I mean popup is opening as transparent (Ghost) what is the problem. ??