When I create pie chart with SVG, browsers render incorrectly

I want to create pie chart with SVG in WEB, but faced with problem in rendering. For example: http://ift.tt/1hQILij

I tested on Safari 8.0.8 (Mac) and Chrome 43 (Windows).

Result: http://ift.tt/1L0eUKU

When I set attribute value of path to "M 50 50 L 50 0 A 50,50 0 0,1 100 50 z" or "M 50 50 L 50 0 A 50,50 0 1,1 0 50 z", all worked perfectly.

Why?