To look at a webpage you use something called a "web browser". Sadly not all browsers are created equal and some issues only exhibit themselves in certain browsers.
Sometimes if you haven't told us already we might ask you what browser and version you're using so that we can try to replicate your issue. Although this sounds complicated you'll be glad to know that someons's already built a website for that.
All you need to do find out your browser and version go to http://whatbrowser.org/ once you done that send that info over to us.