Proxied site 500 Error

I am using Cloudflare on many Wordpress sites hosted on Hivelocity.
It was working fine, but for few weeks suddenly some of the sites started throwing Error 500 when I enable proxy. When I disable proxy Error 500 disappears. Several domains with proxy work fine.
For example is fine with proxy but is getting error. Please advise how to fix.

Ivo Braggiotti

Seems to load fine for me

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