Trying to host three sites from the same server

Thanks in advance,

Well, I am using nginx server and I want to host three different sites, One is developed using laravel, the other two is completely vuejs. I have three domains one for each. Configured them correctly. The day after configuration, they all worked fine, I could visit any of the sites, But on the third day upon trying to visit the sites, only one of the vuejs sites is accessible. I re-did the whole installation and the same thing happened again.
Could this be a linode thing or there is just some configuration I am missing. Please advice.