I replaced some device state images on Indigo Server (same file name, different graphic). I restarted the Mac and the iPads.
But no matter what, it is caching old device state images on Touch. However, once Touch is uninstalled an reinstalled, it looks perfect.
iPad Mini 2 with iOS 10.0.2 on iOS Touch 2.0.5
Mac Mini 5,1 with macOS 10.11.6 on Indigo Server 6.1.11
I wonder if it has to do with the growing file size issue?
See before and after screenshots: