i have a thank you page link as a return url after fill out the form (http//:domain.com/thankyou). it works fine, now for so some reason the thank you page have extra unique number at the end of the url http//:domain.com/thankyou?aliId=4671489. Please help
Yes, Charlie, that is a new parameter that now shows up on all follow-up page urls. If you use google analytics, you'll want to add it to the parameters that analytics ignores, probably.
This was a recent change that Marketo made to the all Follow-up pages displayed after a form fill. I believe that it enables analytics tracking. There is a discussion item that explains how to disable this at https://community.marketo.com/MarketoDiscussionDetail?id=90650000000PXQaAAO