There has been a recent change in the user interface that I think is buggy.
When selecting a link on someone's reputation page, not only does it navigate to the post selected, but it also expands/collapses the list of reputation actions for that post.
If one is simply clicking, they are sent to the selected post. The expansion/collapse of the list is just noise before the page change.
If one is shift-clicking (at least in Firefox), the selected post is opened in a new window after the list is expanded/collapsed on the reputation page. There is no way to go to the linked post without expanding/collapsing the list any more.
For me, if I want to expand/collapse the list, I would rather do it using the triangle to the left, as was intended for that UI element.