I thought I was drawing a vertical arrow but now I know better, I have just tried it again and when you click and drag vertically you get nothing. When you drag up slightly off the vertical you get the shape on the right which I thought was the strange arrow. I clicked the right hand handle and dragged it right and got the diamond shape. I dragged it further and got the horizontal arrow. I got the shape on the right by selecting it and dragging the rotation handle.
I do think vertical arrows should be easier to create than this.