I had this problem a while back, and here's the answer I received: If this happened in a previous session, you'll need to visit the station's "backstage page" to make that change. Here's how to edit thumbs from the backstage page: >From My Collection, visit your station list. Tap on the name of the station you'd like to edit. If you're a Pandora Premium subscriber, this will take you directly to the station's backstage page. If you're a free listener or Pandora Plus subscriber, this will start your station, so tap either the Thumb or small "i" icon in the upper right corner of your screen to continue to the station's backstage page. >From the station's backstage page, tap on the Edit icon (the small pencil to the left of the play button) to edit your station. Scroll down to either your Thumbed Up Songs or your Thumbed Down Songs. Tap the (-) iOS or (X) Android beside whichever thumb ratings you'd like to remove. Hope this helps. ... View more