PixelFed

Somehow I still seem to have a hard time dealing with Fediverse and Co. Currently with Pixelfed. I'm looking for hashtags like #eosr7 or #irishwolfhound, but no results will be found. But I created such posts myself. If you can't find results through the search, you can't add the hashtag to the following hashtags. If I click on such a hashtag in my posts, I can subscribe to it.

Why can't I find posts about the search?