Why do my bank account balances all say n/a?

I'll take care of your query about the bank transactions not dated in chronological order, @Michal3.

To begin with, you can easily arrange your bank account transactions in chronological order on your banking page by selecting the dropdown button in the Date column to rearrange the transactions. Here's how:

1. Go to the left navigation panel and select Transactions.
2. Select the account tile you're working on.
3. Toggle the dropdown button in the Date column to rearrange the transactions.

You can also refer to the screenshot provided below for visual guidance:

After that, you should be able to proceed with categorizing and matching online bank transactions in QuickBooks Online.

I'll also add this article to learn how to reconcile your accounts so they always match your bank and credit card statements: Reconcile an account.

If you have any further concerns about arranging the dated bank transactions, please tag me in the comment section, @Michal3. I'll assist you in any way possible.