The chart tool has the option to format Y-axis data as Percent. When this option is selected, the value of .65 will be displayed as 65%, and the Y axis ticks will go from 0% to 100%. This is true when the data source is the current found set - i.e. when the the data is coming directly from the fields in the records of the current found set.
However, when the same data is input to the chart as a return-separated list - i.e. the selected data source is 'Current Record (delimited data)' - the value of .65 is displayed as 0.65%, and the Y axis ticks go from 0% to 1%:
A file showing the problem is attached.