Application doesnt work through cloudflare

Hello so I am using cloudflare tunnel on my home machine. I run there some simple php software and when I want to do anything there it says this error:
Id parameter not found in POST neither GET. But when I try it with IP address of this machine it works, so it doesnt work only when I access web through cloudflare, can someone help me with this? Can anyone telm if its possible that cloudflare blocks some POST parameters?
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