Re: Ground type % incorrect
its the right section (though you should have used the suggestion thread, or the BP talk page of the article), but Bulbapedia is a wiki, you have the ability to edit it yourself.
Re: Ground type % incorrect
Percentages are in process of changing due to the new generation, so no wonder if there are some inconsistences.
Also, a lot of Bug were introduced in Gen V...
Re: Ground type % incorrect
We can likely automate the percentages based on the amount of Pokémon in the categories. I'll look into it (or get one of my minions to do so...)