What is the significance of the -ve 'b' value or -ve intercept for the linear Langmuir isotherm plot??

I recently plotted some of my experimental data in a Langmuir linear isotherm plot. I have got R2 = 0.9994 & ARE% = 1.25, i.e., the data are fitting very well, but the intercept or 'b' value is coming in at -ve. Is there any physical significance to that value, or is it somehow wrong? Please help me if you have any proper idea of that Langmuir isotherm with the -ve 'b' value. I thank you in advance for your kind support and help.

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