dynamic chart data includes one row too many

[jrtaylor]

I have a chart which uses data from an array which increases in size as I add data daily.

I'm having problems with the final row or two of data. Note how the attached chart line "drops off".

the horizontal axis is the date:

=OFFSET(results!$AE$23,0,0,COUNTA(results!$A$23:$A$64000),1)

the vertical axis is a set of data (beginning at about 0 and rising to about 16,000):

=OFFSET(results!$AF$23,0,0,COUNTA(results!$AF$23:$AF$64000),1)

the chart data begins at row 23 and should go to row 908, and stop there. But it seems like it keeps going. Any ideas (aside from cropping the pic?) Thanks!