It's a little odd that you're not having this problem on other sites... can you tell me what operating system and browser (including version) you are using and I'll look into it?
Other than that, in the meantime, you can either adjust your screen resolution size (right-click on the desktop and a menu will come up if you're on PC), or hold down the CTRL key and hit + (to make bigger) or - (to reduce) the size of text on pages. If you're on a Mac instead of a PC, use the COMMAND key then + or -.
Hope this helps in the meantime.
Online Community Manager