STEP Import - Multibody case, First body is getting wrongly scaled data from STEPControl_Reader

Hello, I am trying to import STEP files with STEPControl_Reader. It worked for mostly all files.For a single multibody STEP file, it's not working perfectly. For the attached file '3D FRONT WTB.STEP', when i import a file first body is getting very large w.r.t other bodies. When we check the body parameters like volume, area, etc,  those are very large quantities for only the first body. Though this file imports totally fine in any CAD. If you think i am missing on something please let me know. I am sharing the code snippet used for STEP import. Please help me with this issue ASAP    

           string name = Path.GetFileNameWithoutExtension(theFileName);
            STEPControl_Reader aReader = new STEPControl_Reader();
            IFSelect_ReturnStatus aStatus = aReader.ReadFile(theFileName);
            int ic = Interface.Interface_Static.IVal("xstep.cascade.unit");
            string unit = Interface.Interface_Static.CVal("xstep.cascade.unit");
            Interface.Interface_Static.SetCVal("xstep.cascade.unit", "M");
            unit = Interface.Interface_Static.CVal("xstep.cascade.unit");
            if (aStatus == IFSelect_ReturnStatus.IFSelect_RetDone)
            {
                bool isFailsonly = false;
                aReader.PrintCheckLoad(isFailsonly, IFSelect_PrintCount.IFSelect_ItemsByEntity);

                int aNbRoot = aReader.NbRootsForTransfer();
                aReader.PrintCheckTransfer(isFailsonly, IFSelect_PrintCount.IFSelect_ItemsByEntity);
                for (int n = 1; n <= aNbRoot; n++)
                {
                    bool ok = aReader.TransferRoot(n);
                    int aNbShap = aReader.NbShapes();
                    if (aNbShap > 0)
                    {
                        for (int i = 1; i <= aNbShap; i++)
                        {
                            TopoDS_Shape aShape = aReader.Shape(i);

                            IKernelBody body = new OCCBody(aShape);

                            ReadOnlyCollection<IKernelBody> subBodies = body.GetBodies();
                            if (subBodies.Count == 0 || isTopLevel)
                            {
                                body.Name = name;
                                (document as OCCDocument).AddBody(body);
                            }
                            else
                            {
                                for (int j = 0; j < subBodies.Count; j++)
                                {
                                    IKernelBody sn3DBody = subBodies[j];
                                    sn3DBody.Name = name + "-Body" + (j + 1).ToString();
                                    (document as OCCDocument).AddBody(sn3DBody);
                                }
                            }

                        }

                    }
                }
            }