> Configuration file included in the post. I already checked it.

You have shown only few excerpts (like there might be other access_log
directives in other parts included config files (easily missed when doing
include path/*.conf) etc).

For example if you can reproduce the issue with such config (I couldn't)
there might be a bug in the software:

events {}
http {
log_format main '$status $remote_addr - $remote_user [$time_local]
"$request" ' '$body_bytes_sent "$http_referer" ' '"$http_user_agent"
"$http_x_forwarded_for"';
access_log logs/access.log main;
server {}
}

rr

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