Your 3D model’s topology is weird mainly due to non-manifold edges, messy edge flow, or overlapping geometry.
Non-manifold edges (shared by too many/few faces) break structural integrity. Messy edge flow—edges not following the model’s natural shape—causes uneven surfaces or editing issues. Overlapping geometry, often from rushed extrusions or skipped boolean clean-up, creates hidden distortions.
To fix it, use your software’s geometry check tools (like Blender’s "Select Non-Manifold") to find problems, then adjust edges to align with the model’s form for cleaner topology.