None of the captured images on that site are displayed in their correct aspect ratio because they're all un-scaled caps of the video, Moth3rs looks particularly stretched because it's anamorphic PAL whilst the official/Dr_Gonzo's/Zion's/Farsight's are anamorphic NTSC and the rest are letterboxed. Perhaps it should be pointed out on the comparison site which format the sources are from, PAL or NTSC.

If the caps were scaled so they're displayed at the correct aspect ratio on a PC screen they'd lose detail through the scaling process, making it more difficult to compare clarity between the sets so direct captures are displayed.