Popup not centering on mobile version

I’m creating a mobile application that has a button for companies to test the creation of certain files on the page.
I created a popup so when the user clicks on the button, it appears. On a page, when clicked on the mobile version, it appears centered. Already on another page, it appears going to the right. How can I resolve this?
Configuration of my mobile page where the popup is not centering:

popup configuration:

thank you for the help!

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