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I have filed a support ticket and was informed that "Landing page visits are cookied for the individual landing only. If you visit another landing page you should not see the information from a previous landing page populated." but this doesn't seem to make any sense to me as previously lead information populated from one landing page form to the next as long as the cookie wasn't cleared unless they made some kind of new change I am aware of.
You're being given incorrect information here. PreFill on Marketo LPs is based on the associated lead, which will persist across all pages that share the Munchkin cookie. So provided the pages have a common parent domain (all pages on pages.example.com obviously share the same parent domain, since they have the same exact origin, but pages.example.com and pages2.example.com also share the same parent domain example.com).
What you may be seeing, at least in part, is high latency in lead association on your instance or pod. People often make the mistake of thinking that something that is usually too fast for the naked eye -- the background lead association -- is actually guaranteed to complete before the next page is rendered.
Either way, you need to be able to reproduce the issue to some degree or it's never going to be solved. If you provide a link to two of your LP URLs I can run some tests to see if PreFill is correctly working.