Website active submission form return to login page


I have a website with a submission form. the final user after completing the text and click submit it returns to login page as if the session has expired. it is an intermittent problem and only when the site DNS is proxied through Cloudlfare
The site is located on one single server with one single public IP.
i tried disabling most of the features from cloudflare in order to pinpoint the problem. i made a rule to not cache the site content and still the problem is repeating from time to time.
if i disable the cloudflare proxied dns entry the problem disappears and there are no issues with teh website user submission form.

any help would be greatly appreciated


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