Customer field fax shows mailadress shop

Hello,

Does anyone knows what to do with this? When a customer want to registration in checkout and fills no faxnumber in, in the CMS i see the customer and see the field of fax isnt blanco but it shows my shops mailadress?

I'm having problems with the registration for new customers so i hope this is the cause...

This is my other problem:
http://forum.opencart.com/viewtopic.php?f=20&t=89328