Passwordhash gets saved on modification, then the original password doesn't work anymore.

In the administrator of a modified oscommerce website, the possibility to add customers and their password was added. When saving the new client, the typed password gets transformed into an unreadable hash. This is working and is ok. But when you want to edit that client later, it seems like the hash from the password gets saved as a password. Not the wanted effect. See screenshots. Ideally would be a separate section or pop-up for the password. Or an other solution you can think of.