Touch screen accuracy when browsing

I bought my PB right after Christmas and have been enjoying it very much. One problem for me involves one of the reasons I bought it and that was to access the discussion forums in my online degree program. I ca:confused:n log on to the institutions blackboard system just fine but when I get to the module page my touchscreen becomes innaccurate. I have to touch about a half inch below the menu button or link I wish to access to get the right one. On any other website the accuracy of the screen is dead on. Any ideas how I might correct this? It is a big PITA and like I said it works fine on any other web page.