Dolphin is not able to report the correct size of grouped files/folders inside ntfs partitions.  Using Kubuntu 12.04 with KDE 4.9.1.  Also happens under clean installs of Fedora and OpenSuse with KDE 4.8.0.  This is a problem since I cannot reliably copy/move files and folders from Dolphin.   
Every time I hit the "refresh" key inside the file/folder properties window Dolphin reports a different number for the size, and every time I try to move files with Dolphin it copies a different amount of data all the time.
This does not happen when selecting single files.  Only when selecting several files and folders.

Reproducible: Always

Steps to Reproduce:
1.Select several large files and folders inside Dolphin
2.Right click and go to properties
3.Hit refresh key for size of folders
Actual Results:  
Random size every time

Expected Results:  
Give out accurate size