Hello Kchancock,
Welcome to the Community page,
You may have made the bank inactive when there was a balance on the account? But it should have created a journal to cancel any balance out.
Though it may be a home currency adjustment where the account shows as essentially cleared with one currency, but due to the home currency adjustment it may be showing a balance on the other currency.
We would suggest you ring the helpline on 0808 168 9535 and they will be able to set up a screen share with you and guide you through this and look into this more for you as well.