Thanks for the screenshot Vivienne.
I can see the account which has been used for the adjustment looks to be a bank account which will explain why the account won't balance now. You will need to delete and recreate the adjustments to the correct accounts with the correct dates(Adjustment Date), baring in mind this will create a 0 exception in your VAT. what ever the adjustment is you will need to make sure you create the relevant income or expense adjustment account but this can't be a bank account.