**Blender Version**
Broken: 2.79, 2.80, 2.81, 2.82
**Description**
Pinning vertices on some meshes in the UV editor is not functioning as expected. Unwrapping after pinning leads to vertices displacing and deforming.
**Exact steps for others to reproduce the error**
Note: 'UV->Seams from island fix it.
Steps to reproduce the problem from the default startup blend:
# Remove Cube
# Add Monkey
# Switch to UV Editing workspace
# Set 'Sticky Selection Mode' to disabled
# Move two adjacent faces to different individual places and pin all of their vertices {F7674685}
# Unwrap
# Pinned vertices that were initially touching have moved {F7674687}
**Original report:**
I'm seeing it somewhat intermittently but it's definitely reproducible. Seems to depend on the mesh itself. I'd encourage trying on more than just the default cube.
1. Unwrap a mesh using ‘Unwrap’
2. Select some vertices in the UV Editor
3. Pin the selected UVs
4. Make some changes to the mesh (different seams, etc.)
5. Unwrap again
6. Often, the pinned UVs will move around instead of staying locked in place in the UV Editor.