Trying to add moving average to scatterplot but the lines are showing up crazy

[Clobianco]

Trying to add a moving average line to the lowest daily stock price data. There are 1259 data points. When I enter it, it looks like this picture. What am I doing wrong? 

[#2]

@Clobianco 

Could you attach a small sample workbook demonstrating the problem (without sensitive data), or if that is not possible, make it available through OneDrive, Google Drive, Dropbox or similar?

[#3]

@Clobianco 

Your data needs to be in chronological order in cell range.

The blue line is the data.  The red line is a moving average trendline.

Even though the random data is plotted in chronological order, the "dots" are connected in the order that the data appears in the cell range.