Column blocks do not use entire screen width on mobile

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Gutenberg column blocks display differently on mobile devices on two websites of different ages. Both websites have updated versions of WordPress and the Astra Theme.

I have created the same block in the two websites. Please see the problem:

Older Website, wrong display: Content does not use the screen’s width on mobile
https://avianreport.com/female-mountain-bluebird/#WRONG-DISPLAY-ON-MOBILE

Newer Website: Correct view of on mobile
https://avesdeperu.org/condor-andino-amenazas-extincion-conservacion/#CORRECT-DISPLAY-ON-MOBILE Please help me correct the display on the older website. I have tried “everything” to no avail.

PLEASE HELP!

The page I need help with: [log in to see the link]

 

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