Where you using the following smartapp? [RELEASE] Neato (Connect) V1.2.6c (Botvac Connected Series)
If yes, you may want to post in that thread. Did you have the latest version of the smartapp and device handlers installed? tagging @nathancu as I saw he posted a few times in that thread and may have some thoughts. Support does not offer any assistance with custom smartapps or device handlers.
As you may be aware, Groovy smartapps/device handlers will be phased out at some point.
How to remove those duplicate devices… that one, unfortunately, is the painstaking process of removing each one individually.
I have only seen this being reported once or twice on the forum so I don’t believe it is a wide spread issue. I imagine this one would be hard to figure out. which model hub do you have? brand/model of the switches/dimmers? do you have other family members with access? If support could not figure it out, I doubt I would be able to but perhaps others on the forum can 