Server Change Issues

I know im new here, but I am in serious need for a solution to my problem.

Where do i start?!

I have a reseller package with HostGator.com , and I had one of my personal sites on it. The site was growing too

fast, and taking up too much of my reseller package, so i bought another normal hosting package from hostgator.

They did a complete site copy onto the new server (same account name for site, just on a different one of their

servers)

Old: [url]
New: [url]

I did this swap over 7 days ago. It was successful, everything worked, did my DNS swap and i thought that was it.

Now for the confusing part.
when i type in my domain (www.midnightclub.ie) it shows up perfect, as it should, as it does with 75% of my

members

BUT

For the other 25%, its showing up as the old server. I have been onto my domain supplier, and they said all is

fine at their end, they are seeing the site as they should, have been onto hostgator, and it works for them, they

cant understand what it can be.

Not only this, but people who can get on, might still get the old servers at times. People who cant get on, can

get on from different computers in different houses (hope that makes sense)

I was about to change the site back to my reseller package and scrap the new hosting, but said i would seek advice

from other webmasters first.

Has anybody ever experienced this before? How is it solved? What can i do?