However, when I jump to a mobile view. Two things happen. In horizontal, the back card disappears. And when I go to a vertical view, the text on the back card inverts.
I’ve checked whether one of them was accidentally hidden, but to no avail. Any ideas?
That should resolve your mobile portrait issue as well since you added a rotation on the x-axis on mobile instead of on the y-axis (flipping it upside down instead of around )
I noticed that you had auto focus checked on your form field which causes your page to load focused on that form field, was that your intention? If not, you can fix that in the form field settings: