The reason for the elongated fish arches is speed. Like another post said, you were probably sitting still or drifting across these fish. If you increase your speed while scanning, like between 2 and 6mph, the "fish arches" will look more like what you are used to seeing. While drifting, EVERYTHING will look elongated and distorted. Laydowns look like a jumbled mess, steep drops will look like gradual ones, a two foot tall rock will look like a two foot tall ledge. Speed up a little.