Seems to be a problem on your end. It works fine over here, Firefox, Windows 7.
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I ran into this issue as well a while back (using FF)...and I believe what I did to solve it was to download and re-install the Open Sans font from this site...
http://www.fontsquirrel.com/fonts/open-sans
(You may need to reboot the OS for it to take effect)
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The point cost font on GAs doesn't look as it should in Firefox (but looks fine in Chrome & Explorer).
The digit 4 is unrecognizable...
The digits 0,2,3,6,8,9 have holes on top of them.
The digits 5 & 9 look weird in the middle.
Only 1 & 7 look OK.
I'm not using any add-ons/plugins that change the look of the site - it's all vanilla & at default text size.
This isn't a new issue either.
You can see what I'm talking about in here or just expand each of the following images (they're ordered):
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