Left-side menu in bootstrap template

I've created a glosssary of sorts using the bootstrap template. However, the left-side menu does not 'jump' to the item according to the text being displayed on the right. In other words, this works for the items that are on the page when one opens the learning object, but once you scroll to items not displayed in the left-side menu, the menu doesn't shift accordingly.

Any ideas regarding what I can do to 'fix' this?