Page not scrolling to top of page when clicking on JS link.

Hey Experts,

I'm trying to solve a minor problem on our websites locations map  

If you are on the location page, and scroll down, and click on any of the locations, the page will scroll up to the map, and show an infobox of the location. The only problem is that does not scroll all the way to the top, thus cutting off the top of the infobox.  I'm not sure where to start with this, is it a css problem, JS problem?

Could somebody help me fix this, please?

Thank you