Here's our registration page. https://shop.pacherbs.com/index.php?rou ... t/register
It's a live site, but if you want to register, just put "test" somewhere in you name and go for it.
The admin notification email is delivered with the new users info, but when you log in to the admin area and look for that customer, they are not there. We've been manually adding them in admin, which works fine.
To add to the mystery, ALL tests I've done have worked perfectly. I tested on firefox many times, trying to "Break" the registration form, but it always worked. Also tested fine in IE and Chrome.
So has anyone else encountered anything like this?
I was running this extension, "Custom Registration Fields 1.5.6" https://www.opencart.com/index.php?rout ... _id=620691
I "think" the issue may have started when I installed it, but I cannot be sure at all.
I have since un-installed it through the OC admin, to try and remove it as a factor. Yet the problem persists.
The plugin is a VQmod and claims to not overwrite any files, so, it can't be related, right?
We are running OC 1.5.6.4
Any ideas?

Thanks!