I think I see what’s going on.
The dates on the posts line up with the times Newsblur has fetched the feed. The feed has a date_modifed value for each item but no date_published value.
Both date_published and date_modified are option per the json feed spec.
I’m guessing Newsblur is set up to use the feed fetch time as the item time if no date_published was provided. Probably easy to make it use date_modified if only it is present, but I can understand thinking if a feed doesn’t contain date_published it won’t have date_modified either seeing how they relate to each other.
In the meantime, you could switch over to their regular RSS feed, it properly specifies when posts were published: The Washington Stand
Had to guess my way to it from the json feed url since the site doesn’t link to either…