Find by formula error

Dear All,

I'm not LC-MS expertise. I,m using mass hunter qualitative 1oth edition for analyzing my peaks. When I'm in compound view and I use find by a formula, software didn't find my peptide but when I move in navigator windows, I have the spectrum zoomed of my formula. Can I use this spectra for confirm my compound? can you have any advice and explain why it happens?

thanks a milion for your assistance

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