Puzzled, In need of some help!

I am very confident with my velocity. I ran it through my chrony, but then thought maybe it was giving me false results. So I grabbed a buddies magneto speed and it confirmed the same speed, so I ruled that out. A different scope got mounted last night. I will test it out this weekend, but I believe I found the culprit.

It happens buddy!! got to reading this late....had the same issue with that optic. No matter what I did it was frustrating and then I slowed down and boom it wouldn't track. Never had an issue prior just quit. Sold that guy and moved on. Glad u got it