Help me i don't know what i'm doing wrong

[HardBaller]

Hi all. I'm really new to AC3D and 3d desging and i'm eager to learn all there is to leurn. But i've got a problem. I'm on Second Life and i made my own surfboard in AC3D. Now when i bring it in SL and scuplture a prim (1 block) it comes out kinda funny. I've made 2 screen prints one of the 3d design and one of how it looks in SL. I really hope that someone can help me. Thanks.

The AC3D prt sc.



And this is how it comes out in Second Life