What is the reason, we got both test and control band on LFA in negative sample?

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Dr Azeez Barzinjy

Bahadır, Elif Burcu, and Mustafa Kemal Sezgintürk. "Lateral flow assays: Principles, designs and labels." TrAC Trends in Analytical Chemistry 82 (2016): 286-306.

Kathrine Curtin

Tutorial: design and fabrication of nanoparticle-based lateral-flow immunoassays Nature Protocols volume 15, pages 3788–3816(2020)

A false positive could be due to the high concentration of antibodies. You might want to try a lower concentration ~1mg/mL