Tvheadend

Configured TVH backend to use picons, but the matching was very bad (assume a problem with the picons, not TVH here).
I defined the picon path and checked the prefer picons of channel names at the time

Now I wanted to use my old channel icons again. Unchecked the prefer picons box, deleted the picon path and added the channel icon path. Settings were saved. When I then went into the channel configuration, the picon paths still appear in the GUI in the "User Icon" column. When I select the corresponding box, I can delete the picon path. It appears empty. But when I want to save the change, the picon path appears again. So effectively, I cannot delete it. Also, my "old" channel icons do not appear. Tried "reset icons", but also to no avail.