How do i stop cloudflare modifying my headers?

Hello community! Recently i encountered an issue where cloudflare modify my http response headers. (Changing the name not the value especially the first letter to uppercase). In my server i pass back a header "mycasesensitiveheader" which sometimes gets changes to "Mycasesensitiveheader" for no reason. Its not every request only some of them. Did anyone got issues like this and/or fix it? Would really appreciate any helps.
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