Duplicated items in a category feed

I have no idea why, and I’ve looked into everything I could, but a few of the first items in this category feed are duplicated:

If I go ahead and remove the 101 category from all of them via WordPress, they only show up once in the feed instead of disappearing completely.

The first two posts, “Spotify agora tem playlist para salvar episódios de podcasts” and “Apple facilita divulga??o de podcasts na web”, aren’t even inside the 101 category anymore and still show up in the feed. It’s not a caching issue, I’ve made sure to clear it each time.

Any ideas? Thanks.

• This topic was modified 4 years ago by Rafael Fischmann.
• This topic was modified 4 years ago by Rafael Fischmann.
• This topic was modified 4 years ago by James Huff. Reason: redundant link removed

The page I need help with: [log in to see the link]