QB balance and bank balance way different now, was ok last week, I have undone all the last couple hundred transactions and redid them but no good, pls help?

Hi, @stvibert.

There are several reasons why your bank balance and QuickBooks Online balance may vary. Let me share some of them:

• Outstanding transactions.
• Duplicate transactions.
• Edited or deleted transactions.
• Credit card (liability) account.

You'll know that transactions are matched when you see two green box in Bank Register when you click View register in your bank account. I've attached an image below for visual reference. 

Then, you can refer to this article to know the different troubleshooting steps on how to fix the discrepancy based on what could cause it: How to Fix Differences Between QuickBooks Balance and Bank Balance.

In addition to this, you can check our QuickBooks Online Banking and Bank Feeds page to know more about banking and reconciling.

Always feel free to drop by the Community if you need any help. I'll be around to help.