Feed gets randomly filled with new posts - sh.itjust.works

When going through the post feed, I’ll randomly get 5-10 new posts added to the top of the feed. These 5-10 posts are all new with 1 or 2 upvotes only. Sometimes all from the same community. This happens on local, subscribed, or all feeds. It also doesn’t matter what sorting option is selected. Is this a known issues or an expected behavior?