SVG renders incorrectly in Firefox -

SVG renders incorrectly in Firefox -

i working svg first time , came across problem:

i using svgs icons , works fine - except 1 icon renders incorrectly in firefox on windows. firefox on os x renders fine.

here anonymized version of header placing svg icons in:

http://files.uiux.de/140618_header/

that problem persists regardless if utilize sprite utilized in above illustration or if utilize separate files each icon.

here 2 screenshots of render-issue experiencing. problem little 'dent' on lower end of earphone:

we've saved svgs in illustrator , used svg 1.1 export-setting.

can point out problem seems here?

i'm not seeing error in sample header when @ version of ff (30).

it looks me if artifact/'dent' seeing caused left-most column of pixels of envelope icon next phone in sprite sheet. can tell if zoom image.

what do, create sure things don't happen, not set icons hard next each other in spritesheet. leave few pixels gap between them.

firefox svg