just to add to what @joaomino kindly wrote above.

I see X-Proxy-Cache in your response headers.

This may be an indication of server-based caching (Beyond WordPress)

This will still serve cached pages even if you don’t have any caching plugins.

The cache for your homepage has this expiration date:

Wed, 22 Feb 2017 04:53:10 GMT

I know you said you already talked to your hosting provider, but you need to talk them again. whoever you spoke to seams to be incompetent.

Talk to your hosting provider about

1- purging the proxy-cache

2- Disabling ngix proxy-caching to prevent this from happening again

(if you disable ngix caching you will need to implement an alternative caching solution and there are many plugins that handle that)

Once you take care of that, you should also clear your browser cache.

I am talking to the host provider and copied what you suggested. THey said they have disabled all cache for me but still seeing the issue there. :/ I have clear my browser a few times and still no changes.