Many stations start their channels at .3 on the transmitter channel (I heard why, but I can't remember now), so when it converts to virtual x.1 and the sub-channels follow, the .7 becomes .5.I just had that happen yesterday. The "riddle me this" thread station when I scanned on my other TV showed it as 43.7 but once the signal got better it logged as its PSIP station 43.5