Ghost Custom properties after deletion of custom property.

I had something like that happen and it went away when I refreshed the browser.

I'll mention this to the team to see if we can come up with some methods to batch remove properties. Right now, this behavior is intentional because if a user accidentally deletes a property, we don't want it screwing up old projects that calculate based on that custom property. The custom property value persists in the 'Additional' group until you clear the values out, and, in that case, the custom property will disappear from that takeoff/template.