"Stupid" is a bit strong, @Patricia2147, but you may have just cancelled a booking yourself (versus the guest cancelling). The email is a bit misleading, so I fear you may have been caught out. The 'deduction' sounds like the $50 'fine' for cancelling. If this is the case, you'll also lose your Superhost status.
You'll need to check in with customer service and have them fix this for you. Good luck.
PS. What an amazing view your place has!