IQANdesign 7 Bug with Finite State Machine to place states on the screen if zoom not 100%

While working on a finite state machine, 

When moving a state to organise it, 

if zoom is not 100%, the state can move away from where you want to drop it

In this vidéo you can see, at the begining Zoom is 100% and it's ok

But after when zoom is 80%, the state move away from where I drop it :

I think it's only when moving a little bit,