To reproduce Problem:
- Go to Control Panel -> Site Templates
- Click on "Add" to add new site template
- Form to create site template is opened, curson positioned into first field "Name"
- Now I decided I do not like to create new site - pressing "Cancel" button
- Instead of cancelling and going back - "required field" validation fired. Form stay on the screen
To cancel site template creation I should click "Cancel" second time.
It looks like it is reproduced for all "Cancel" button in all forms with required fields