Low poly 3D models often distort during collisions because their minimal polygon count can’t properly distribute physical forces or align with collision detection precision.
The few polygons leave little structural detail to absorb or redirect impact, so the mesh warps instead of behaving realistically. Distortion worsens if the collision shape (e.g., a basic box or sphere) doesn’t closely match the model’s outline—mismatches between the visible mesh and collision geometry cause unnatural bending.
To fix this, use a more fitting collision mesh (like a convex hull) that better matches the model’s shape, or adjust physics settings (stiffness, weight) to reduce warping without adding extra polygons.