unexpected long indent after colon in web-mode

Question

I have some trouble locating the source of 8 tabs and 3 spaces more than the previous indentation when I'm inside js inside web-mode. These appear after a line that ends with a colon. Example (note that in emacs these are tabs of width 4, except the last 3 spaces which are actually spaces):

        // bind event to schedule visibility toggle:
                                           $('input#scheduleswitch').parent().change(function() {

Anyone a suggestion what might be causing this long indent? Could it be a case-statement related indentation?