I think what you are seeing is normal.
If your TV locks on to virtual channel 6.1 it will automatically be able to decode sub channel 6.2, both of which are being broadcast by the same transmitter on the same real channel, as ADTech said. Mixing a main channel and a sub channel is called multiplexing. The digital information for both sub channels is intermixed and then transmitted by the transmitter on the same real RF channel 23.
http://www.rabbitears.info/market.ph...&callsign=xetv
https://en.wikipedia.org/wiki/XETV-TDT
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channel 6.1 XETV CW, (received sporadically)
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It doesn't help your reception that KVMD is also transmitting on the same channel, which is considered co-channel interference.
And it doesn't help that the signal encounters rough terrain on its way to your antenna, which is why it is called a 2Edge path.
