Can't overlap two series of data in a graph, Series overlap and Gap Width missing!

Out of the message it seems that for "curve graph Force (Y axis) vs Time (X axis)" you do not use dedicated type - scatterplot graph but other one (bar graph?).
The other option is that your times are not just numbers but texts which look like numbers (but are not properly recognized as numbers by excel). It is not uncommon if data were imported from some testing equipnment, which saves data in it's native format (or even in popular csv format).

If the above is not enough consuder one of our "canned advice":
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Attach a sample workbook. Make sure there is just enough data to demonstrate your need. Include a BEFORE sheet and an AFTER sheet in the workbook if needed to show the process you're trying to complete or automate. Make sure your desired results are shown, mock them up manually if necessary.

Remember to desensitize the data.

Click on GO ADVANCED and then scroll down to Manage Attachments to open the upload window.