The new videos don’t make it to the fee right away because of the \ the cache.
Our widget uses cache to make it load faster and to reduce the server load, so it doesn’t request YouTube each time someone browses your feed. Instead, it requests YouTube once in every 24 hours, pulls in the videos by the specified criteria, stores them in the cache, and displays them from the cache.
After the cache is expired, the widget requests YouTube for the videos again, and that’s when the new ones make it to your feed.
If it’s been more than 24 hours, and the videos still didn’t appear, please let me know. Our devs will be happy to look into this for you.