Hope you’re doing great!
I am suspecting you’re setting the blog page to be that create blog page,
meaning in Settings >> Reading >> Front Page Displays
You’ve set a static front page
and have selected the blog page.
If that’s true, please remove the blog page from this setting.
This setting overrides the template, discarding all your selected settings.
Please try that “if my guess was correct” and let me know
If I was wrong, please let allow me admin access and I’ll check it out for you