I used an over the counter drop tester (OTO). I also had my levels checked at 3 different pool stores. I have a gunite pool
Here is a summary of the latest numbers.

Temp:80
Saturation Index: 0.4
TDS: 850
CYA: 50
Tot. Chlorine: 0.4
Free Chlorine: 0.4
pH: 7.7
Tot. Alkalinity: 139
Adj. Total Alk: 124
Tot Hardness: 314

Since these numbers, I have added pH decreaser to normalize the pH. I have also added 4 lbs of trichlor yesterday, but the current chlorine level is around zero.
I thought about your idea that high chlorine may be bleaching out the test, but when I check the chlorine levels about 30min after the shock, it tests in the high range as you would expect ( dark yellow) (greater than 5.0 which is the limit on my tester). It is on the following day that the chlorine levels go to near zero. I wonder if I have an algae bloom somewhere in the piping of filter than I cannot see, although the water is clear. Thank you for the help.