whois question

so am using http://www.whois.sc/MYdomainname.com to check infos on my domain name.

My question is about

"Reverse IP: Web server hosts 294 websites"

does it mean that all those 294 websites are host by the same hosting company?

if so why when I do reverse IP and have the first 3 listed and check them, they are online while mine website is down?

 

 

 

 

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