Email blast sent to "do not sends" - what happened?

We sent out an email blast last week and it went out to contacts who were tagged as “do not send”. Any idea why this would happen? When we scheduled the blast - it even said that 63 contacts would not receive the email. This morning we looked at the stats and saw that they all received it anyways!

Thank you!!

Hi @Ugis_Zvilna you may want to reach out to support for this problem as it may take some researching.