I’ve seen others report this issue in the following thread:
I think it had to do with the device not getting fully configured. Perhaps try pushing the “configure” button in the device handler?
@billdwhite Unfortunately, this is something that is going to be very difficult to handle with the way that SmartThings handles button devices and its dependency on the cloud. There are just way too many variables and the SmartThings system just isn’t snappy enough to give consistent results. For example, it sometimes takes SmartThings several seconds to process that a button has been pushed. So, if you hold down the button, wait a few seconds for the dimming to begin, and then release the button, and wait a few seconds for the dimming to stop, you are probably going to end up on a dimming level other than what you wanted.
What you want can be accomplished with Z-Wave to Z-Wave devices with an association made, but that is something that SmartThings isn’t really equipped to handle.