If you look at the jb log for it you will see that jpost is blocking requests to fetch the rss feeds. And indeed trying to do so with curl also fails
curl -I
https://www.jpost.com/rss/rssfeedsar...iconflict.aspx
HTTP/2 403
althogh the feeds work in the browser, so I guess they are doing some kind of analysis of the http request headers beyond user-agent.