OK, and how does it look like in backend, after order is placed?
Using option “Edit order”, you can see what profile fields in order are filled with what data. Is this “Duplicate 1st line street address” in one field, or in two separate fields?
The street address is in two fields but the customer did not type this twice - I have asked many customers and none remember typing twice and that is not a logical behavior unless somehow the software suggested that they should.
Example of that is that some countries do not have states maybe Hong Kong and Singapore but my store requires a state in the address.
I do not require a second street address line and many customers do not have this problem.
It is a mystery to me why this is happening in a random way…
Next Ecom did the actual changes to the theme.They have different rates depending on what you need. If you know exactly what you want and tell them very clearly with illustrations you can have the work done quicker and save money. https://www.ecom-labs.com/