This is the setting within Jetpack thats causing the issue! I was digging around and found this to be the culprit.
Further into looking into this…. Its this setting within Jetpack…. Turn it on and off and its makes or breaks the Credit Card Dropdown.
-
This reply was modified 1 year, 9 months ago by laveniuk.
So just to update people!
I did as you suggested and disabled all the plugins, It started working.
Then started to turn them on one at a time until i got to the Jetpack plugin.
That broke it!
Unsure why, but i started a topic under their section here!
Credit Card Dropdown on Mobile not showing | WordPress.org