Game screen is too big on my phone

hello.
My HTML exported game plays fine on most phones, but on some phones the screen is more than 2x bigger and only 1/4 of the screen is visible.
I have fixed the screen size to 720X1280 in the Gdevelop settings.

What could be the cause of this? Is it an issue with the phone’s own resolution?
Is there any way to make it fit the screen on all phones?

When I created the project, I was working within the box, but on some phones it was zoomed in to 2x. Is this an issue with the resolution of the phone(Android)?
I usually make it 720*1280, and I have 3 options in Properties, which one will work for the widest range of devices?
I usually use “ No changes to th game size”.