v4.0.1 Update Has Broken Registration During Checkout

-- url of the page with the problem -- : www.aiohealing.com
-- HikaShop version -- : 4.0.1
-- Joomla version -- : 3.9.0

Users can no longer register during checkout after the v4.0.1 update.
Yes, cleared cache.
No, not using any SEF program.

If you Fill out the information for Registration then hit REGISTER, the system says you have not filled out the form properly (see screenshot).
But if you instead hit the NEXT button it will take you to the next screen then BACK to LOGIN again.
If you try to Login it says that you do not have an account...
CANNOT GET AROUND THIS in checkout -- users can REGISTER before checking out, that is working fine.

Excellent. Your patch worked great!

Thank you.