When I Try do drag an Object with Holding Left Click, Corel copy the object.

Hi guys!

I have Corel Draw x7 for years, and now, all of the sudden, when I try to drag an object/image with left click, instead of dragging, he copy the object/image (like I was holding left click and release right click.)

I've already rebooted my Computer several times, and tried another mouse, but the problem persists.

Can anyone please help me? 

Can't work like this!

Thank you for your attention!

Rui