Lights remain after being deleted

I’m using Unreal Engine for archviz. I have a space lit with a SkyLight and a DirectionalLight. I then added BounceLight using spots. I decided I preferred the scene without the bounced light and deleted the spots and bounce cards. The light changed correspondingly in the viewport, but when I rebuilt the lighting (Production quality) to make a movie the bounced light reappeared in the scene. I saved the level under a different name and checked that the bounce setup was really deleted – but the bounce effect is still there. I can’t get rid of it. Any ideas what’s happening?? Thanks!