Deleted post still shows on RSS Widget

Hi,

I deleted some posts but they still appear on my RSS Widget.

I completely deleted them, I wen to Trash and clicked on Delete Permanently.

However posts still appears on my RSS Widget, but if I check the feed URL these posts doesn’t appear.

I’m not using any Cache Plugin for WP, so I don’t know what is going wrong, and I tried to hard-refresh the page on my browser.

Any suggestions? It’s kind of annoying to see those posts still there.