This is intentional. It is set up for cross-eyed viewing, as indicated on the image. The anaglyph is generated using topographic data from the Shuttle Radar Topography Mission to create two differing perspectives of a single image, one perspective for each eye. Each point in the image is shifted slightly, depending on its elevation. When viewed through special glasses, the result is a vertically exaggerated view of the Earth's surface in its full three dimensions.
Anaglyph glasses cover the left eye with a red filter and cover the right eye with a blue filter.
3D Glasses Direct is an online source for 3D glasses. They will even send you a free pair of paper 3D glasses when you send them a stamped self-addressed envelope.