Hello Samuel, thanks for the reply and sorry for my late response.
I noticed this problem on Android, with the Newsblur app. I just made a quick test with one of my feeds, accessing it from the Android app and from the web. In the web, stories are correctly hidden whilst in Android, stories that should be hidden are shown (with the red dot on the left side that indicates they are disliked, but nonetheless they are shown).
I trained the stories a long time ago so I believe it is not a problem of a story that was loaded before training. I’ll say the problem then is on the Android app side for the moment.
A picture is worth 1000 words so here are some screenshots.
Web:
Android:
Notice the shown stories with the red dot on the left side.
Edit: typo