On the site, once you update the event after initial publication the first date in the event will then link to the last date of the event.
Instead of linking to the date you selected (i.e. October 4 ) the link will take you to the last date of that event, November 8th (i.e. /2016-11-08/). This only happens for the first date of the event after updating the event. If on the See All for the event and select any date other than the first date you will be taken to the proper date.
Currently, we are working to correct this on the development copy of the site.