Yes — this is normal for a very wide-angle view. What you’re seeing is perspective distortion, not a defect in the lens. With wide lenses, objects near the edges can appear stretched away from the center, and nearby subjects can look exaggerated compared with more distant ones.

This is different from optical distortion such as barrel or pincushion distortion. In your example, the lines remain straight, which points to perspective effects rather than a lens fault.

It happens because of camera position and the very wide field of view, not because the lens is bad. To reduce the effect, try changing your shooting position, keeping important subjects closer to the center of the frame, or using a less wide focal length. A tilt-shift lens can also correct perspective in some situations.