Good evening Alex and welcome to the Events Calendar forum!
As a side note, in order to receive the best support possible, I would recommend using the premium support forums (in your case Event Tickets Plus): https://theeventscalendar.com/support/post/ in the future.
As a first step, could you please provide us with your complete system information using the instructions found in the following link?
https://theeventscalendar.com/knowledgebase/sharing-sys-info/
The downside of using the Pre-sales forum is that this information cannot be posted in a private reply.
Could you at the very least tell me which e-commerce plug-in you are using?
Secondly, just to clarify, when you say the email that you receive when the tickets are purchased, are you talking from the viewpoint of a client or from the viewpoint of a WordPress administrator?
Best regards,
Geoff B.