Domain / Sub-Domain Crossing

Domain / Sub-Domain Crossing


I'm encountering an issue with user tracking. Our main website is, and our product is located at We log user information when they complete our sign up form. But we're encountering several instances where we're storing unusual information when the user crosses domains, one possible example is:
  1. User starts at
  2. Clicks Login and is brought to
  3. Clicks the logo at the top to get back to
  4. Click the sign up form
In these unusual cases the referrer URL and first visited URL are from the same domain (, has anyone encountered this issue before and if so, how did you go about resolving the issue?

Thanks in advance for any help you can provide.
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