If I highlight all of the columns and insert a scatter plot, the result appears as you have described, but that approach causes Excel to misinterpret what is intended. I believe the issue is that the first column is intended to be a common set of x values for all of the other columns (which contain y value data). When I select only the first two columns and insert a scatter plot, I generate the expected plot (see the gray curve). Going back and then selecting column A together with columns C, D, E, etc. and copying them to the clipboard and then clicking on the plot and performing a Paste>Special...to insert additional data sets on the plot, and checking the box to ensure that the left column is treated as the x values...the resulting set of plots shown below is generated. You'll probably want to eliminate the lines (i.e., show only points) for clarity, but there doesn't appear to be an issue plotting the number of data sets that you have.
