Why am I not seeing some SVG's in Fontastic?

The SVG's that I have added - which have been exported from Sketch aren't showing. Is there something wrong with my format?

This is an example of one og the SVG's I've exported.
Have I exported it wrong? Do I need to do something with it before uploading to fontastic?

<svg height="16" viewBox="0 0 12 16" width="12" xmlns="http://www.w3.org/2000/svg"><g style="stroke:#000;fill:none;fill-rule:evenodd;stroke-linecap:round;stroke-linejoin:round" transform=""><path d="m11.5 6c0 4.5-5.5 9.5-5.5 9.5s-5.5-5-5.5-9.5c0-3.038 2.462-5.5 5.5-5.5 3.037 0 5.5 2.462 5.5 5.5z"/><path d="m6 3.5c1.381 0 2.5 1.119 2.5 2.5s-1.119 2.5-2.5 2.5-2.5-1.119-2.5-2.5 1.119-2.5 2.5-2.5z"/></g></svg>


This is an example of one of the SVG's that aren't showing from the .svg file produced by fontastic

<glyph glyph-name="pin-1" unicode="'" d="M12 506c0-5-6-10-6-10 0 0-5 5-5 10 0 3 2 5 5 5 3 0 6-2 6-5z m-6 2c1 0 3-1 3-2 0-1-2-3-3-3-1 0-2 2-2 3 0 1 1 2 2 2z"/>


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