Tania Akther don't bother to let the results affect you. however, this tells you about the inconsistency in data points used for the plotting of your data, as it may come from poor reproducibility and repeatability studies of the baseline data for the effects of concentration. You may need to go back and also see if you used non-linear extrapolations that gave you these judgments, then you can feel free to accept the variation in the results. However, to add to it it is inconsistently unacceptable to use R-squared to decide the adsorption process of the mechanism. Have a great day