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Creating multiple instances of imported object causes mesh artifacts

Found something odd by accident. If you import an .obj made in blender's scultping tool, create a new appendage model group, and start placing shapes, you'll notice that:
  • First two shapes get placed correctly
  • Placing a third shape breaks the mesh of the 2nd shape - some of the vertices go back into 1st shape
  • Trying to place additional instances doesn't create new shapes - only more of the other object's vertices start merging with the first shape.

This only happens within a single appendage group. You can create a new group and place 1-2 shapes with no issues, but the moment a 3rd instance is added within a group, meshes start to break.
There's nothing special in the log: https://pastebin.com/rZ9Kjg6Z
Since this is not an issue with in-built claw shape, could the culprit be on the blender's side? The imported meshes have high poly count, would it be a feasible explanation that the group is hitting vertice limits, and it's just folding in on itself?

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