chart/graph issues

Anyone!

I created a report that contains both a graph and its data. I have it
set that the detailed data represents the data that is graphed. The
graph is within the sorted sub-footer. The issue I am having is that
when I run the report, most of the graphs match the appropriate
record's data, but a few don't match, either they skip a record or
repeat from the previous record.

Any ideas how I can fix this problem?