downloading reports from overseas mainframe

I am uploading reports to our website and various customers are downloading and seeing the currently uploaded reports, except one company is seeing the reports which I have uploaded the previous week not the ones that I have just uploaded. The only thing that is different is that this customer is tied into a mainframe in Germany. Could this be the problem? I have checked the downloads from my end and see the current reports, I have had other outside companies to check the downloads and they see the current reports. But even if myself and the problem company check the reports at the same time they are seeing the last reports not the ones which were just uploaded reports. Any ideas on this one? Thanks.