What version of LMS is this? There was a bug in LMS 3.0 where the master and slave DCRs will be out of sync when ACS is enabled.
As for DFM, even if the sync box is unchecked, when you remove a device from DCR, the device will be deleted from DFM. There is nothing you can do prevent that. A device will also disappear out of DFM (and DCR) if the device is no longer in ACS or no longer is a relevant ACS NDG.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...