HPLC , Plexa Pax Procedure

I am working on the SPE plexa pax to capture Cyanuric acid using strong anion exchange, however, when i checked the fractions resulted by eluting Cyanuric acid with  5%acetic acid +95% methanol,  i got very high peak area bigger than orginal concentration of cyanuric acid (10ppm) , however, i checked the blank which is 5%acetic acid +95% methanol, I got the same peak area  belonges to the fraction. Is there any comment for that please?

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