Edge loops in 3D models overlap when scaling due to two main issues: tightly spaced loops or scaling axes misaligned with the geometry.
- Tightly packed loops: If edge loops are too close together, resizing the model pushes adjacent edges to cross—like scaling a character’s arm with uneven loops along its length. - Misaligned axes: When scaling isn’t aligned with the model’s shape, edges shift unevenly and overlap.
To fix this, evenly distribute edge loops before scaling or use proportional editing to adjust edges gradually.