Column blocks do not use entire screen width on mobile

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]