Why does my weight painting 3D model weird in Auto-rig?

When weight painting a 3D model in Auto-rig, weird results typically stem from uneven vertex-bone influence or conflicting rig settings. Weight painting controls how much each bone affects vertices—if influence is too broad, narrow, or overlapping, your model may stretch, bulge, or twist unnaturally. Common issues include unnormalized weights (vertices tied to too many bones) or unassigned vertices. Fix this by using your auto-rig tool’s "clean weights" function or manually adjusting vertex groups to restrict each bone’s influence to its intended area; this ensures smoother, more natural deformations.