Shopping cart fields - messy layout

Joomla 3.10.6
Eshop 3.5.4

I have an issue where the fields for forms in the shopping cart are not aligning correctly, most notably the address details as per the screengrabs below.
I have Bootstrap 3 selected to match the site template (even though it's the same in all versions). If I select the UIKIT3 layout, it's fine but then the layout of product pages goes screwy.
Anyone come across this before and perhaps have a way around it? 
Thanks 

Bootstrap:



UIKIT3:

Hello Andrew Mills,

Sound like the issue comes from the CSS of your template. Please submit a new ticket to EShop category to send me the super admin account to your site so our support staff can help you to check and correct it for you.

Hope to hear back from you soon.

Sincerely, Giang