Ensure that all your observation points are enabled/activated under "edit observation points" checkmarked under the "No." column. The vertical lines that are shown are the default confidence intervals. I normally just set the confidence interval to 0, in the "edit observation points" under "reference values", or just import the .pow data to a spreadsheet.
Biggest headache for me has been the labels being displayed, those confidence intervals and the little black tickmark indicating the datapoint's x-intercept on the 45 degree line. Skews your vision, especially when you have 150+ observation points.
I just made a suggestion in the suggestion forum regarding these vertical lines.