Problems with X axis in a bell curve

I'm working with Excel 2010. I've managed to create a chart showing bell curves for sample data and random data based on the sample mean and standard deviation. My problem is with the x axis, as it is showing the numbers 1-8 ( the bin levels of +- 3 standard deviations) not the bin values themselves. If I select the data within the chart menu it shows the bin values for the x axis but they don't appear, I get the numbers mentioned above and the edit button for the x axis won't activate. Any assistance would be appreciated, especially as this is my first tentative post.

I've used the scatter plot connected with smooth lines and the curves have plotted o.k. The data is a list of weights in number format. I've just re-formatted the columns to make sure they are in number format. The bin results in the histogram show the + or - 3 standard deviations except for the +3 level which displays as more. Could this be the problem as it will introduce text into a numerical array?

Just tried it and that is the problem. It's strange that it doesn't apply the same rule or format to the -3 s.dev.. level in the bin. It must be something in the histogram formulation that this is produced. But I do now have a comparative chart based on S.dev. values and not the frequency numbers. Many thanks. Now onto understanding the relationship of levels of skew and kurtosis. I understand what they are but not sure about whether the levels are significant or not. Another thread perhaps. Thanks again as it allows me to understand and present the data in a much better fashion.