There are plenty of others who are way more qualified to answer this, but assuming you're on Z/IP, make sure you don't have any ghosts, then analyze your mesh to see how those devices are 'connected' to the gateway and the rest of the network. I use the community 'Z-Wave Mesh Details' app to see what the mesh is doing. (Note that the Z-Wave mesh has a lot of voodoo sprinkled in, so you can make mostly assumptions, and never actually know why it's doing what it does.)
For the ghosts, there is a wonderful long thread here somewhere that shows you how to identify and eliminate them. I'll try to find it. (ETA: Here you go... How To Remove Ghosts using hub tools or a UZB Stick )
