Start payment or not

New user here. I’ve accepted to trade via SEPA transfer. I’m about to transfer payment but I’ve checked the IBAN number given on ibancalculator and it gives a different BIC (i.e. different bank) than the BIC shown under the payment information. This is a little suspicious and I’m hesitant to send payment.
Since I don’t see a way to cancel the trade what are my options in this case? Will I loose my security deposit since I didn’t start the payment?

Can you PM me the IBAN, BIC and onion address of the peer? I had a similar case as dispute where the BIC was not correct.
You can open a dispute by cmd+o. you will not lose your deposit of you have not broken the contract.