Error 521 every time but the site is up and running

Hi guys,
I do experience a very weird issue.
A domain has been marked “moved” on CF despite the fact it is up and running.
DNS are OK, eveything looks fine.
Now, even if I disable cache, I get 521 error most of the time.
I’ve tried everything I know to solve it but it’s still there.
Please help.
Thanks.

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