This issue can happen if you add incorrect size of splash screens to the phonegap package (manually). We have experienced this issue one time when we added incorrect size of splash screens in order to configure application for iPhoneX (since in this case you have to manually replace splash screens within phonegap package) device.
So, if you add custom splash screens be careful and check the size of the images you want to add manually.
Solution: we replaced our custom splashscreens with the original mendix one's and now it works. I'm still not sure why this was happening, since our custom splashscreens had the recommended sizes. Glad that is works for now.
what layout are you using?
we had issues with the default atlas layouts and made our own which solved some issues.
We use the Atlas default Phone layouts. Following your reaction, I also tested wit a clean layout. Unfortunately that did not help.
What settings did you use on your own layout?
its sctaully wierd, because the icons on the top of your screen are under the black bar, so it seems like what ever is rendering your screen thinks that this is the actual device size.
maybe you have the rendering engine set to iphone5 or something?
and im not sure what your mean with “setting on your own layout”
maybe its phonegap that is doing something wierd, what happens when you connect to your app without exporting it via phonegame?