Got it, thanks!
The other posts should be pulled within the next 48 hours. If this period is over and the new posts still didn’t show up, please let me know. I’ll be happy to look into this!
I completely understand your point that it would be awesome to update the widget faster, but unfortunately there is no way to do this now. We have a request for this on the Wishlist and you can upvote it here 
- Remove or reduce cache time