In the current download of the styles from the NL website, namida_machine has custom lemming sprites. None of my styles are meant to have custom lemming sprites, so I can only assume this either got applied to the wrong style, or was a user modification that accidentally got included in the download.
Aside from that, L2 Shadow, L2 Highland and Arty Underwater also have custom lemming sprites in the current download; but these might be intentional. (Arty Silhouette and Xmas also have them, but I *know* it's intentional in those cases.)