Latest RSS Post Not Showing Up in Feed

Hello,
I have a WordPress blog here:
https://www.blastframe.com/blog/

When I go to https://validator.w3.org/feed/ to check my WP blog feed, it shows my latest post. However, the latest post does not appear in my Google Chrome extension, RSS Feed Reader, nor if I visit the URL:
https://www.blastframe.com/blog/?feed=rss2

Any ideas on how to get these to recognize the latest post?

Thank you,
Kevin