Part throttle knock?

[Taffy]

I use a JC 93 street chip. I just installed my Knock meter. It goes into red sometimes if I boost it up at 70% throttle or so. I can actually hear it knock as it sewwps past 10 psig then it stops. BUT if I go WOT, there is no knock at 16 psig. Only knock at WOT is on shift.
Is wheel spin knock for real? I did a small burn out and my KM went FULL RED.
Thanks, ERIC.