DNS resolution of our load-balancer works only when enabling cloudflare proxifying

The dns resolution of our load-balancer subdomain stopped working two days ago. It was working perfectly, and we didn’t make any changes since.
It start working only when enabling Cloudflare proxifying (orange cloud) however we cannot use that with some of our services.

Is someone have any clue about what is happening?

Is someone can help me with that?
Is there someone experiencing the same issue?

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