Why are when invoices are pad and show in the undeposited funds account do some of them not so on the decrease column when going into my current account and some do?

It's nice to see you again here in the Community forum, runnerdean.

One of the possible reason as to why the paid invoices stay on the Not Deposited status is that you might have chosen the Undeposited Funds as the Deposit to account when receiving your client's payment.

To deposit the payment to the correct account, here's what you'll need to do:

1. In the left menu, click the +New button.
2. Select Bank deposit under Others column.
3. On the Choose an account drop-down, select the bank account you wish to deposit the payments.
4. In the Received from column, select the invoices by putting a check mark on the box.
5. Hit Save and close.

Once done, you can go back to the Invoices page and the status should now change to Deposited.

For more details, you can check out this helpful article: Record and make Bank Deposits in QuickBooks Online. 

Leave a comment below should you have additional questions. I'm always here to help. Take care and have a great weekend.