Two identical payments

Can someone tell me why two identical payments for £33.56 have been debited from my bank account? Is it a mistake, and if so, is it mine or Bulb’s? This was the first payment made for this account.

Thanks for checking this with us, @robert1583. This was our mistake, and we are sorry about this. Your payment was requested twice because of technical bug which is now corrected. Again, I am sorry.

We processed a refund to your account on 7th September for £33.56, which should be in your bank account in the next 5 working days.