Free chlorine, Total Chlorine and Combined Chlorine are all interrelated.
Combined Chlorine = Total Chlorine - Free Chlorine.
You only posted a free chlorine reading which shows how much chlorine is available to kill algae. As you know it's very low and you should be adding chlorine ASAP to get this up. If your total chlorine is higher than your free chlorine, that means you have Combined Chlorine and something is eating your chlorine up (algae, organic matter, pee, etc).
You need to raise your pool to shock levels (10ppm+) and hold it there overnight to burn off your combined chlorine, kill the algae and raise your free chlorine.
You should invest in a real test kit. Test strips are notoriously inaccurate. You have an expensive pool...$60 on a good test kit is small change.
I'm no expert...just a long time pool owner. The real experts are at www . troublefreepool . com
Download Bleachcalc free at troublefreepool . com /files/BleachCalc262.exe and start saving money on chemicals.