Perspective vs Cube

Hello, I found one strange issue, I have a cube and a perspective. When I chose the perspective the grand total for the measure I'm using is not correct, but when u chose the Cube the grand total is correct. So what can be possible happening? That's strange. Thanks!

Cube:

          xxxx:   2     3     4

Grand total:  2     3     4

Perspective:

           xxxx:  2    3     4

Grand total:  4    5     6

Update: 

I think it is an Excel problem, I tried it in the cube and the perspective is working, tried in Excel 2003 and works, but in Excel 2010 it doesn't, that's weird.