Importing your OBJ files work in Sweet Home 3D, Blender and Wings3D and exporting to DAE format worked in Blender and Wings3D.
So I guess meshlab and Maya aren't able to reuse a vertex of a shape in another shape (here it's vertex #184). Strange, it seems to be a good way to optimize OBJ files size, and I don't think OBJ format description says it's forbidden.