Low Viremia

So uh last year on October, i got test and my VL was 71 . My cd4 was 600+. I have taking Teldy for from 2024. The thing is the first year i got undectetable. Now suddenly it got detectable. And this year, its still quite the same. My VL is from 71 to 70 and my CD4 are 684 like that. What are happening to me? I occasionaly miss dosage due to work and sleepiness due to my Psychiatric medication