Not a bug

I can see that the confirmation emails are definitely being sent out from your event. In at least come cases, I have verification that the recipients have opened the emails.

It looks like you registered someone using your email address on February 16th at 10:45 AM UTC (which is 5 hours ahead of Eastern time). We did send you an email on that. If you did not see it, check your SPAM or junk folder. Unfortunately, sometimes our emails do get flagged as junk, but there is nothing more we can do to prevent that,