I was looking at that too with all the warm weather we have had. I heard that on those hot days, the snow at the top of WP was slush so maybe there was some runoff increase.
Byers Canyon does not flow into the Colorado River, it is the Colorado through Byers Canyon below Hot Sulpher Springs. I agree that there might be something amiss with the gauge.
Like it or not, all of us are the result of a sexual act.