(Tried on Unity 2020.1, 2020.2, 2020.3) I'm getting an inconsistent result with Composite Collider 2D that uses Offset distance to close gaps between colliders. Step-by-Step: 1. I have an game object parent with two of 2D box colliders, but they have a little gap between them. 2. I add an 2D composite collider, set it to geometry typer: polygon, and increase the Offset distance to where the colliders connect in straight lines (forming one big box with 4 rounded edges). 3. If I now for example: delete the two current box colliders and "undo" them back, the composite collider isn't connecting with straight lines anymore, but have some dips/rounded edges where the box collider gap is. 4. If I increase the Offset distance to where it connects with a straight line again and redo the step above (remove and undo back the colliders) it gives the same problem. I can keep doing this and the offset distance keeps increasing. --- Is this a bug or am I using the offset distance property incorrectly? It's almost like it's being additive for every time it get changed. Removing the composite collider and re-add a new one fixes the increasing offset distance and it's back to first step in my step-by-step above.