iOS modal viewcontroller disappears

Hi,

I'm trying to present a native view controller modally on top of a unity game for ads. All goes well and everyting is working except when the user clicks the home button.

If i double click the home button the modal view controller immediately disappears and the unity player is back on top, however the xcode logs state that the modal view controller is still showing (if i try to present a new one).

Am I missing something?

Thanks!

I've attached screenshorts of what it looks like. 1. The modal view controlelr with the ad appears fine. 2. On double click on the home button, it's gone.