Board Thread:Support Requests - Getting Technical/@comment-2168890-20151011151837/@comment-4018164-20151011173540

That's just a problem with wikia's current image thumbing system, issues of this sort take place all around wikia. Hey.youcp, one of the admins in the Club Penguin Wiki, actually contacted the staff a few days ago about this issue, and it turns out that the team is currently not focusing in updating the current system.

Your best (and probably only) solution is to make a script that replaces the source of all thumbed gif images with their actual full-size source. Or you could scale down problematic images using proper image editors, such as Photoshop or GIMP, and then re-upload the resized versions.