Hi,
I have exactly the same problem after Flexible checkout Form update. Form fields are appearing correctly but on “My account” page or “Order received” page some field like name, surname, city, postcode are displayed unnecesary in separate lines like:
Name
Surname
City
Postcode
before update was:
Name Surname
Postcode City
and it looked a lot better. I’ve tried set up CSS classes (as you wrote above) but there is no change. I have no idea how to fix it. Please, help.