Thanks John.
af_registration is class from WPMUDEV which I have been using for years and it works fine. All my actions/filters are using that, so I would see 2 of everything, so who knows.
I was very naughty and stuck the button inside a div and hid the second one with a CSS rule 🙈
.btn-container {
&:last-child {
display: none;
}
}