Differences between preview and downloaded app

Hi, I am making an app to display an external site an some other sections. it seems ready to be published when I open it on the thunkable app or on the web preview. But if I download and install the app, the elements are all in different positions. I organized all objects in groups and set specific coordinates for all groups (also in the block section when the page open), but groups and some elements inside the groups don’t stay in the right position. Moreover some group let me change from “on screen” to " on device", but others don’t. How can I do? Thank you very much
On Live test:

On downloaded app:

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