OK, That doesn't completely make sense.

Did the R0013 + pool water remain clear? Or was it so cloudy that the CYA "didn't register"?

Clear ==> CYA < 20 ppm. // Super cloudy ==> CYA > 100 ppm

If the CYA test mix was super cloudy,
  • mix 1/4 pool water with 3/4 tap water.
    (Use a shot glass, 1/8 cup measure, or even tablespoon measure.)
  • Add 1 unit pool water and then 3 units of tap water to a glass & stir
  • Retest mixture
  • Multiply result x4 for actual CYA reading.

If it was clear, tell me whether you measure in the AM or PM, and whether it was sunny on the day you tested.