The canvas UI collision is not working properly with the raycast of the mouse. Visually the UI elements are much smaller than their collusion detection area. I don’t know what is wrong. I might have setup something wrong in canvas or it is possibly a script issue.
This video shows the issue. The items are picked up. But the mouse is highlighting the items in the inventory long before the mouse visually collides with the items. You can see the information popup window for the items show up even though the mouse is visually no where near them.
https://dl.dropboxusercontent.com/u/81486705/fleshtheworld/video/canvas collision.mp4