Are you still listening to EDACS, or the new P25 system.
A note from the new NSRS P25 system:
NSRS P25 State of Nevada Talkgroup numbers are equal to NSRS EDACS Talkgroup number (in Decimal) plus 10,000.
NSRS P25 County and City Talkgroup numbers are equal to NSRS EDACS Talkgroup number (in Decimal) plus 30,000.
NV Energy P25 Talkgroup numbers are equal to EDACS Talkgroup number (in Decimal) plus 60,000.
Early on there seemed to be an initiative to change all the TG's using this theory, however in practice it seemed to be a bit more complicated as some TG's did not follow this pattern.
So, not sure if that explains anything at all in your case.
I just log any new TG's that jump out and see if there is a match with the EDACS system on another radio. As long as you have ID search on, you shouldn't miss anything.