Then, your CYA is over 100. Try the dilution test on this one, too, to try and see if you can't get a little closer reading. Dilution isn't super accurate, but better than nothing.
Why is your CYA climbing? Have you added some recently and if so, when and how much? Or are you using a stabilized form of chlorine such as trichlor tabs or dichlor shock powder?

Glad to hear you didn't add all that chlorine at once!