I'm new to CAT control, so apologies for what may be a simple fix. I have a FT-991A connected to a computer via USB cable only. I'm able to play with the VFO on flrig, and see the change on the physical radio. I'm also able to spin the physical VFO knob on the radio, and see it reflected on the software. My understanding of fldigi documentation is that the waterfall is the best way of tuning to wherever. However, the waterfall seems to be totally off base with where my VFO, flrig, and fldigi says I am. What simple little thing am I missing?