Trying to click on butterflies can sometimes cause the browser to zoom in on the action probably because multiple clicks invokes some sort of shortcut. When this happens it's not that obvious how to zoom back out and the website appears to store the zoomed behaviour (I had to reset it this morning). Game play can continue but if you try to click on anything you have to click further down and to the right. This was most apparent in the Garden area.
It would be better if the zoom was disabled