There's a couple bits of trickery here and I can't read the O-scope display to be sure. Your SWR meter is supposed to measure only the power delivered to the load, and the SWR measures the power reflected from the load. It appears to be zero reflection or the meter is broken. But the Oscope measures the total voltage at the point on the line, so if you moved the Tap point along the line you would see a peak and a valley value and the ratio of those two values is the definition of SWR. But if the SWR meter reflection measure is correct, you don't have any standing wave. The upper plot on the O-Scope shows the sine wave value and normally you would need to take the peak-to-peak value divided by 2 (to get Peak voltage) and divided by square root of 2 to get RMS value of the voltage. I can't read the amplitude of the O-scope but if you did take 1/2 peak to peak as the 22.4 volts then the O-scope is reporting a higher power than the SWR meter. funny thing is you say you see 22.4 V / 24dBV but normally we use 20Log10(V) to get dBV, so 22.4 V peak would compute to 27 dBV. If the dBV reading is from the FFT, it might be already dBV rms (22.4/sqrt(2)). You might try to move your T point closer or farther from the antenna (use a shorter or longer length) and see if the voltage changes. If it does, it means you DO have a non-zero reflection and you do have some SWR, and the SWR meter has an issue. I suspect a bit the SWR meter as zero reflection is a little suspicious. You could try lowering your power to a very safe level and take off the load, to see if the SWR jumps up. If it does not, suspect the SWR meter.