My banking page in Quickbooks is showing a different balance "in Quickbooks" to that which is in the Bank and "Bank Balance". What have I done wrong?

Some factors can affect the balance of your bank accounts, Devilschild99. Let me help you sort this out.
 

The QuickBooks Balance can be affected by all transactions in the register and the ones that aren't reviewed yet. While the bank balance is determined by the transactions in the register only.
 

To ensure they're equal, we'll start with categorising and matching the downloaded transactions based on your bank statement.

On the other hand, I'll include this article to help you while working with bank feeds and reconciling the bank account: Reconcile your accounts so they always match your bank and credit card statements.

Feel free to get back to this thread if you need more help. We'll reply as soon as we can. Take care!