Computer Help.

I haven't had any trouble, I am using Safari.
The thing with all these web browsers it that while they all convert the same HTML code into web pages, they also have their individual ways of handling the code.
Some browsers ignore certain code because it isn't in their library. When writing webpages there are a whole load of things the author has to be aware of in order to maintain compatibility, for instance some browsers will tolerate missing end of line codes and some will simply ignore the whole line.

My guess is that Xobor have rewritten a few things and then found some errors and incompatibilities. They wouldn't have done anything directly with our page as it is newly written by software for each user each time it is opened, but they may well have been tinkering with their software.

Always having the most up to date version of your chosen browser is the best way of ensuring good results.
Also, don't be afraid to install some other browsers. I would recommend Windows users to install Safari for Windows and perhaps use it in preference to IE, it does things differently but is more user friendly and tolerant than IE. Google Chrome is worth installing but only use it when trouble occurs with your main choice of browser.