Button "create account" disabled

In "new account", the button "Create Account" is disabled. It depends on whether you use the mouse or the tabulator.

If you use tab key from "surnames" to "email" the button "create account" is enabled, otherwise is disabled.

here is the validation : /user/user-tool/tool/src/webapp/js/userCreateValidation.js

and here the form : user/user-tool/tool/src/webapp/vm/user/che_users_create_vm