iTween and grid layouts ?

Hi, I started using iTween recently for simple animations, and while it offers exactly what I need, I've encountered a small issue : I have an object which parent has a grid layout, but when using the MoveFrom command, instead of coming back to the correct position within the layout group, it seems not to be affected by the layout group and gets placed right in the middle of the parent GameObject.
Is there any specific reason as to why this could happen ? Thanks a lot for your help!