Are you sure you saved the workbook after you made all the changes?
Are you sure you opened the same workbook that you saved after all the changes
I would expect user error to be the cause (sorry). But if it happens enough so
that you can duplicate the problem, maybe those macros do more than you know.
If you can duplicate it on demand, I'd open excel in safe mode and test it.
windows start button|run
(macros will be disabled)
File|Open your workbook and do some changes, then save the workbook.
Close it and reopen it (still in safe mode).
If the data looks good, then maybe it is a macro.
If you can't duplicate this, I'm still betting on user error.