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You must always (always) supply your URL for questions like this.
We have no idea what code you're using to store and retrieve data from cookies, and when you're running that code; plenty of such attempts are broken due to race conditions or other implementation flaws.
Also, "on submission the values are not always stored" needs more precision. Does "stored" mean saved to the Marketo database? Or does it mean posted to the Marketo database? (Not the same thing.)
Thanks for the reply Sanford. I was hoping for some pointers to investigate myself hence the reason I did not share a link.