Shortcode showing instead of Counter in widget

You probably want to quote the format string, although I doubt that would cause the issue described.

[jellyfish_counter start=759999 end=760212 direction=”up” format=”$000,000″ interval=10 tenths=false speed=200]

The only reason I can think of the shortcode showing is that the plugin isn’t actually active?

Anyway, I’ll assume that this is now resolved due to age.