Odd profile

[[Ja...]]

I’m recalling the raw data points from 3 smaller separate curves into 1 big curve and I’m puzzled as to the results and graphic printout on the report. If I analyze and plot the 3 separately, there’s no problem at all. Now if you look at the supplied plot (the gaps in the plot are supposed to be there), there’s a blue line that’s being added. I don’t know what it represents, and as you’ll see it’s being included in the analysis which makes the results useless. What’s even more odd, is that I can re-run it using the same raw data, and get a significantly different blue line and significantly different answers. Anybody know what’s going on and how do I fix this?