I have a 536 programmed with a simulcast trunk system with only 2 talkgroups, along with a VHF analog system, with only 2 frequencies. It seems to only receive the first channel in each "zone", if you will, while scanning. Only the 1st talkgroup and only the first VHF frequency. However, when set to manual, the scanner does receive the 2nd channels, so I know they are correct. Thoughts?