we found this issue happen with our domain / everything in my zone has lost.
what is happend?
Your domain was purged by Cloudflare as it is not properly configured (any longer). It does point to Cloudflare but also includes two other nameservers, which does not work in this context and hence Cloudflare does not consider it a valid setup.
The domain probably never properly validated. You need two remove the two custom nameservers and set up the domain from scratch.
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