1. Can you post a screenshot of the problem?
2. Wich AddOns are you using?
Also, the "icons", do you mean your actionbuttons or do you mean minimap icons? Or perhaps the buff icons?
Until we have more information on how to solve the problem I can say that /calendar also opens the calendar. In some UI compilations the calender is also bound to right or middle mouse click on the minimap.
EDIT:
http://forum.spartanui.com/index.php?topic=1898.0
Seems to be the same issue if I am reading the context right?