Filefield upload on user register page validates whole form

I added filefield(http://drupal.org/project/filefield) field to CCK node type used as nodeprofile.
I checked "Show this node profile during user registration" for this node type.

So the plan is that anonymous user goes to user/register, uploads file with "Upload" button, registers with "Create new account" button.

But user registration fields (login, email, password) and nodeprofile fields are validated and turned red after "Upload" submission but not after "Create new account" submission as expected.