FYI - I went in to check bounces and tried to delete only some of them by checking those boxes. The system deleted all the ones in the list regardless of having been checked or not. Might want to fix that.
When I went to check your last few sent emails, the contacts in your bounce list weren't all showing as deleted. I'm also not seeing any recent import activity for your account, so it doesn't look like you've had to re-import those contacts within the time frame of your post.
If you believe the contacts were erroneously removed from the system, I'd advise calling our general support so they can go over the emails live with you, and securely reference specific contacts, list names, and email names.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ William A Community & Social Media Support