Closed Loop Reporting and Multiple Campaigns using the same form

I hope I am able to explain this properly.

We have a webinar campaign and a tradeshow follow-up campaign. In the tradeshow campaign it's a simple "personal" email to thank those that came by our booth and to invite them to the webinar or contact us for further discussion. So I've added the landing page and form for the webinar to both the Webinar campaign and the Tradeshow campaign, however, when people register for the webinar, they are showing up in the Tradeshow campaign in Salesforce and the Webinar campaign is empty.

So based on this it seems like I can only have the landing page and form in 1 campaign in order for the CLR to work correctly. Can anyone confirm this for me? Or should I be doing things differently?

Thanks!