Channel 19.2 is actually a subchannel of WAHU-27 (real channel 40), so that is why you are seeing this analomy. Channels 19.1 & 19.3 are on a completely different frequency. You may need to try raising or lowering your antenna a few inches to get it out of the the dead spot for WCAV-19 (real channel 19)
See
this link & click on the stations in your area to see the actual frequencies to better understand what is actually going on.