CYA test says zero, but should I add more?

So I noticed my saltwater pool is struggling to keep up chlorine. There was a big storm here over the weekend, and chlorine read zero when I went to service the pool today. I ran the CYA test from my tf test kit, the reading was also zero, water clear all the way to the top. Maybe a little haze at most. My test strip says I have CYA though. Is it possible that the kit test has gotten old, or that rainwater at the top of the pool is distorting my results? Last year my CYA was probably around...

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