Paul, this might be due to a number format which shows no decimal digits
but a major tick spacing of 0.5. Excel wants ticks at 0, 0.5, 1, 1.5, 2,
2.5, and 3, but the number format forces them to 0, 1, 1, 2, 2, 3, 3.
Change either the tick spacing or the number format to make it right.

- Jon
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Jon Peltier, Microsoft Excel MVP
Peltier Technical Services
Tutorials and Custom Solutions
http://PeltierTech.com/
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Paul wrote:

I've created a simple line chart with smoothing. The chart has two data
series. The chart looks fine except that the Y axis has each value
duplicated.