Cartoon Network currently lists the show as having only 2 seasons. The oldest archive link that I can find is from 2014 (the page from when the show was finishing airing does not load anything of use). While there don't seem to be any episodes listed, the clips on the page appear to be from episodes that Wikipedia/Fandom consider to be from Season 3, but Cartoon Network's site has them labeled as Season 2.

It's possible that Wikipedia and Fandom bumped the season number to coincide with the break in air dates between S02E12 and S02E13 rather than follow Cartoon Network's numbering.

I see, makes sense to use their own season numbering, thanks for the detailed reply!