PROPERTY LIST - Can't see all items in Episerver back end, is this a bug?

I am working on my first Episerver Project and I have come across a problem with the UI.

I have a block Type with a PROPERTY LIST property. However when I add more than five items you can't see them all in UI.


http://pasteboard.co/Hf2ynJ4.png  < Screen shot
I have another 10 Rows I can't see.... 
Is this a bug in Episerver??