Same name displayed multiple times during webinars

Hello,

For my organization, I set up webinars. Of course, I send the invite containing the registration link to the internal targeted audience. During the event, I noticed that the some names appear repeatedly, one of which appeared even 17 times. Usually we encourage the audience to cascade the invite.

I understand from a previous post that "each participant should use the meeting link that they will receive on their email after they register on your meeting and not share the meeting link" and honestly I think this is happening already. Only the registration link is cascaded, and not the meeting link received afterwards.

Moreover, the Zoom support contact we have for our company said that those repeated names should be taken into account only once, as it is just a displaying error of Zoom, thus when building my reports I should consider only the unique viewers, and not the total users. 

Is there any kind of solution to prevent displaying the same name multiple times? How do I know for sure how many participants were in my webinar? When sending the invite, should I warn the audience of something? 

Thank you much,

Alexandra