Low poly 3D models aren’t "broken"—their angular, simplified appearance is a deliberate choice to reduce polygon count for better performance or stylized design.
The "blocky" look comes from using fewer basic shapes (polygons) to build the model, which makes it load faster in games, animations, or apps where speed matters. This is an intentional trade-off between detail and efficiency, not a flaw.
If a low poly model has actual gaps or glitches, it’s likely a modeling error (e.g., incorrect mesh topology) or export issue—try using a tool like Blender to check and fix small defects.
In short, the "broken" look is usually intentional, and real issues are fixable with basic modeling tools.