Great catch, this was a real bug. The “More from this folder” section in the Train dialog was loading folder-scoped classifiers from all folders, not just the one you’re in. So when you were training in “Trucks”, you were seeing classifiers that actually belong to “z.Alerts | Work”.
Fixed now, the Train dialog filters folder-scoped classifiers to only show the ones that match the current feed’s folder. I also made it so that when you click Manage Training, the feed chooser defaults to the folder you’re currently in instead of “All Folders & Sites”.