Did you guys know that graphics with an odd length can't be center-aligned to graphics with an even length? I did, and yet I never noticed it on any of these sprites... Whoops!
Thanks to the graphics being scaled up to 200%, I was able to move the sprites a "half-pixel" (actually just 1 real pixel). The sprites now should be properly centered in your games.
** Please redownload the pack and replace all of the overworlds in your projects!! **
Thank you so much to SandalDaniel for pointing out this error and helping me identify it clearly so I was able to fix it!