Sales Invoice Custom Fields

I am using the Custom Fields to insert some general information - Banking details and contact details. When creating or editing an invoice everything looks fine but when Viewing or creating a PDF/Email all spacing has been removed. I have entered Banking detail on the left and contact detail right-justified so that these all appear in the same “box”. Viewing and PDF cramps everything left justified.
What am I doing wrong and how can I fix.

You must build a custom theme using Liquid:

Display in Manager is not What-You-See-Is-What-You-Get. You might need to hire a local programmer if you don’t have the skills yourself.