All widgets moved after dropdown option is selected in iPhone

Hi,

I've created an experience with a dropdown menu at bottom grid & some buttons and header. When the dropdown menu is selected in 'iphone' all the other widgets mentioned above got moved up from its original position because the dropdown menu follows its default iphone UI for dropdown (roller), not like the one that's showing in the preview in vuforia studio. But once the option is selected from dropdown, the widgets didn't come back to its original position. Please guide me how to fix this.

The snapshots attached here are in order from left to right.

Thanks!!