Plot keeps on flipping

I have two plots which I am plotting. They are almost similar with a difference of 2 units. So both the graphs are identical but are slightly different in terms of magnitude. When I plot the first graph, I get my desired values plotted correctly. The moment I plot the other graph in the same plot, either one becomes the mirror image of the other. I tried using the negative sign in one so that in case it flips, it superimposes itsefl on the other but I am still getting the mirror image. I use hold on in my code.

Could someone please help? The graph seems to be flipping and not superimposing is my issue.

[Adam Danz]

Provide relevant sections of code. An image of the figure might be helpful, too.