I think I sort of found the problem with this bug. It has something to do with the current zoom of the web page. Since the current screen of the game doesn't fit my screen, I figured to zoom out in order to have a full view of my game. Thats when the problem started. It wasn't until I zoomed in was I able to click on the objects correctly.
I'm having the same problem as well, though I have to move my cursor I bit to the right for the object to be highlighted. When playing the Demo, I didn't have any problems at first. It was when I bought the early beta that this bug started showing up.