Thank you.
Sorry, last version v2.3.6

1
For the missing css/jquery I see this in the console
Missing #ottotal > div:first-child jquery.checkout_one.min.js:5:934

Running a find in notepad++ it finds
includes\modules\pages\checkout_one\jscript_main.php (2 hits)
Line 15: define('CHECKOUT_ONE_OTTOTAL_SELECTOR', '#ottotal > div:first-child');
Line 16: // define('CHECKOUT_ONE_OTTOTAL_SELECTOR', '#ottotal div span'); //-Value for YourStore template

2
Isn't the the output of yoursite.com/your_admin/opc_debug_redirection_error.php?id=ccc-yyyy-mm-dd same as the data in the mentioned logs?

Anyhow, what shall I do with it? ;)

I retried, and get same behaviour, I noticed that it kind of registers the default Florida (USA) when first entering data in creating account, and then when entering the shipping info it gets that (different than the former), when going to see "my account" there is no trace of Florida, yet it does come up in the log file.