It most likely has to do with your hashtags, certain hashtags get you published in certain h-e token communities.
Are those posts also in your blog feed?

The ui simply pulls from the blockchain and shows posts according to their rules.
IF your posts falls within those rules, it gets printed to their feed.

Like I said, it is mostly abandonware at this point, but at some point it could be used as a filter for their type of content.
Look at the hashtags and see if you can spot a pattern.