Is it a bug?

[Amy912]

I use the demo to describe the issue.
html elememts : a tag of div which has class “test”,has a child node .The node is a tag of img ,which has class "myTest".
css : .test{
height:750px;
width:480px;
transform: matrix(0.8,0,0,0.8,120,-35);
}
js: $(".myTest").Jcrop();
result: on this occasion, the moment I drag and drop the "ord-ne" or "ord-e" or "ord-se" or "ord-s" corner,Jcrop does not work well.