Graphical issues while scaling skewed text

Hi,
I have an isometric board. On some of these tiles there are textfields which are skewed so that the text runs parallel to the sides of the tiles.
The user can zoom out giving a wider view of the board. This is done by scaling the parent tile to about 0.5 of the original size. When doing this at a certain threshold the text will no longer be parallel to the sides of the tile and will look as if the text pop’s up.
Does anyone have any ideas of what causes this.

Thanks

KK