Scheduling Conflicts and recording 2 channels on same frequency in QAM (1 Viewer)

[ub435-q v2]

I've been using MediaPortal for a few months now to record QAM in the United States. I read in the wiki (maybe it's outdated) for MP that as long as the channels are on the same frequency you can schedule more than one recording at the same time. This seems to be correct since I have noticed when adding some programs to the schedule that it adds without stating it conflicts with another program, but it certainly seems to when I browse through the schedule. So I tried to let a second recording take place while another recorded, but the second recording never started even though it did not state a conflict. SHOULD I be able to record from two channels on the same frequency with QAM in MediaPortal? If not, why am I not always getting the conflict notice when there is a conflict? It seems to happen with particular channels consistently. Is there a setting to make it work? I'm only using the ASUS card in MP (all others disabled). This is not that big a deal to me, but I'd appreciate any help or clarification. Thank you.

(The reason I tried this is I just bought a KWorld UB435-q v2 USB stick (it's the cheapest in the United States) to add to the ASUS EHC3-150 card that I've been using. The KWorld doesn't work in MP with QAM. Anyway, I tried the TiVme app from the KWorld site and it found the QAM, and I found out that many channels are on the same frequency when I tried multi-view in TiVme. I was able to view four channels at the same time from the one tuner. When I scanned channels on the ASUS in MP, I noticed there were varying numbers of channels found on the different frequencies, 3 on this one, 8 on that one, etc.)