test.zip

hi guys, i am facing an issue on FF and Safari with this lib. in my case, i am trying to drag items from right side nav, and drop them on target area. with the sample code as attached, it works fine on Chrome and IE, but broken on FF and Safari. the problem is the ghost image is too far away from mouse cursor as shown in the attached image.

can you guys advise how does it happen and what is the workaround? thanks very much.