IPB log me out when ever i refresh

a few day ago i add Cloudflare on my website. i change the dns
now when ever i try to do any thing in my admin panel or refresh the page its log me out
and say Your IP address does not match this session.
screenshot: http://prntscr.com/lzk8j8
some my user also complain that they are logout automatically if they didn’t click remember me on sign in page

i am using IPB ( invision power board ) v. 4.3.5

Please tell me what i have to do to resolve this issue is this any configuration issue or what?

Your server might not be restoring Visitor IP addresses:

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