This looks like the font file you're using lacks some rendering hints (all points that touch the median line should be annotated as such, it looks like they aren't).

Another version of the same font or the same font from another source may work. Webfont sites often try to tweak the hinting tables, they're trying to make the fonts look better but it breaks stuff all the time.

It's weird, it looks good on my machine, using FF25 on Ubuntu.