when I go to select data I see "=Count!$B$4:$B$44" so it's set to start on B4 not B5 on the counts tab.
When I open the select data dialog and check the definition of the Goal series, I see B5:B44. When I select the data series in the chart and check the formula bar, I get:
I'm not sure why your copy of Excel is saying that the range is B4:B44 while my copy of Excel is saying B5:B44, but I suspect that the problem is somewhere in that discrepancy.
In the spirit of standard Windows operating procedure ("have you tried restarting your computer?"), have you tried recreating the chart from scratch? If I select A3:C44 and insert a line chart, the new chart appears to automatically detect the correct ranges.
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