Pivot Chart not displaying correct data

Hi everyone,

I have just created a pivot chart and it seems to be displaying a count of the cells with values in rather than the actual values themselves.

I have attached my spreadsheet to give a better idea of what I mean.

The data table shows the overtime hours worked by employees, per month. If they worked x amount of hours in January, February and March the pivot tabe is showing a 3 for that employee. If they only worked x amount of hours in January and February then the pivot table is showing a 2 for that employee.
I'd like the pivot chart to show the actual number of hours that have been worked each month by each employee.

Thanks for your help.

Alex