This is a very difficult issue to explain so I'm going to give you some instructions on how to replicate it and see it for yourself.
1. Go to the Kendo menu demonstration page demonstrating the possible directions.
2. Hover over the "Girl's" menu.
3. Hover over any sub-menu.
When you do this you should see that all the arrows seem to "bounce" when the sub-menu opens. If you move the mouse up and down the "Girl's" sub-menu items you can clearly see all the arrows within that menu bounce. This does not happen in any other menu (except when it is the third or greater menu option along and I've checked the CSS, it does not appear to be that which is causing this; I suspect it is a scripting issue.
This also happens on the Orientation demo page, and it even happens with you change the orientation to vertical.
I've attached a screencast in case it is just my browser, but I'm using the latest version of Chrome (v. 31.0.1650.48 m).