Tvheadend

Am using OpenELEC 4.0.3 on RPi with TVHeadend and WinTV-HVR850. This is an ATSC over-the-air-only setup. Automatic mapping doesn't work at all. Can manually map channels in Services list of port 9981 web interface. The first time they load into the Live-TV channel listing, they seem mostly right, but they rapidly corrupt. After subsequent reboots or restarts, although the channels load, they're labelled all wrong. It's like the front end is reading different records than the ones being selected.

I have to delete the entire EPG via the 9981 interface and re-map all the channels in Services again to get them to reload. Attempts at numbering the channels in the EPG just bring random results.

Why aren't these pieces of tvheadend working in concert? Why are they prone to getting out of sync with the channel designations?