Good catch, thanks! That was a locale bug. If your browser is set to a European locale, the number formatting was using periods instead of commas. Just pushed a fix, should be live in a minute or two.

You're right that the per-employee share is the same regardless of salary. That's the point: it shows what the company made per head, and then what your salary would look like with that added on top. The salary input just personalizes it.