I need more details.
using this on the update page for fldupdated column:
<input type="hidden" name="fldupdated" id="fldupdated" value="<?php echo(str_replace('"', '"', $row_WADAtbl_post['fldupdated'])); ?>" size="32" />
would mean that the field value would not be able to change since it would always be set to use the value stored in the recordset?
The database should not be able to update itself, someone would need to access the users account to update the records.
you should contact the account owners to make sure they are not making the changes.