when i apply remove doubles there is a destroyed mesh aspect on object mode (pressing z) and the mesh is perfectly fine one i go in edit mode, is it a display issue or im i doing something wrong? its the same mesh on these pictures, left on object, right on edit mode

when i apply remove doubles there is a destroyed mesh aspect on object mode (pressing z) and the mesh is perfectly fine one i go in edit mode, is it a display issue or im i doing something wrong? its the same mesh on these pictures, left on object, right on edit mode

Edit: the mesh looks fine on object mode as well when if i save it to .obj and delete-reload it. but the problem persists when i save the whole scene