Looks like it may be the newest version of Chrome that is jacking it up, as we can’t recreate the issue on any of the older versions of Chrome or other browsers.
I see the menu correctly (chrome version 59.0.3071.115). Could it be that it’s just the CSS and there is not enough room for an additional item?
I don’t think that is the problem. Chrome 61.0.3163.100 is the only place I’m seeing the issue. How am I suppose to edit it for that version of Chrome only without it then messing it up on other browsers?
Did you try reducing the padding of the menu anchors just a couple of pixels? It should be a pretty rare case, usually chrome doesn’t cause pain between versions.