Try this:
1. Go to Admin > Database Utilities and run the backup utility.
2. Open the Optimize dialog and clear all checkboxes, then select only the option to "Recalculate Balance Due on all Fees" in the current club year. (Don't select the last checkbox labeled "Recalculate and reapply all Payments for Dues..." at this time). Click Start.
3. After the optimization is completed, examine those same clubbers to see if there is any change/correction.
If there are still problems, then re-run the Optimize but this time DO select the 4th and 5th checkboxes.