Do you know why THIS happens?

Floating point precision causes visual glitches in 3D games when objects move to very large coordinate positions. Floats have a fixed memory size and cannot simultaneously represent very large numbers and very small decimal precision, causing vertices to snap or jitter rather than render in their correct positions. A common fix is the 'floating origin' technique: periodically teleporting all objects back near the world origin while preserving their relative positions, keeping coordinate values small and precision intact.