Would suggest reverting the admin/includes/modules/update_product.php file back to what it was before trying to make these changes which may involve also restoring admin/includes/modules/product/collect_info.php and/or admin/includes/modules/product/preview_info.php.
The data stored into the database is affected by files such as these during the storage process. May want to also access the database more directly via phpMyAdmin and review products table record information to see what the sort orders are. The field type could have been left at least temporarily as a decimal considering the software was still storing as an integer. But if there were edits made causing the continuous storage of 656.00 that was a difference occurring that should have had nothing to do with changing from an integer to a decimal number... of course there is little detail about what was really done, so hard to explain what needs to be undone. The multiplication sql only needed to be run one time to address all product in the database.
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