Widgets can't be freely dragged on the screen, overlap

Running multiple instances of Clover, widgets are forced into different sized bounding boxes smaller than the screen, from which they can't be dragged further.
Running an instance of Clover and dragging the lion and the balloon around, eventually, trying to drag the lion will not work. Instead, the balloon will sometimes be dragged, as if the balloon's widget was larger and they overlapped. Found on Ubuntu & CentOS. Below is an image of 3 instances running, each dragged as far to the bottom as possible.

H-Anna / Clover