I’ve just been dealing with an issue on a site where Google Analytics is logging a lot of pages twice, once normally and once with a double slash—“//”—at the end.
Obviously this is worrying. If Google is seeing the same page in two “places” via two technically different URLs, duplicate content penalties and PageRank squandering are distinct possibilities. It also seems to break a lot of the Analytics “Site Overlay” functionality.
Here I’m going to go through what I’ve done to isolate the cause of the issue, and approaches to fixing it.