I've managed to stop that bug from happening, but I noticed there's a new bug.
Anyway to fix this problem, just switch off 8Directions' Set Angle to "No"
You don't want it to rotate, especially if you set the Origin to bottom.
The other bug I noticed is when you are in Platform, lets say you move right, then you just and immediately press Space, then walk left, Once you let go of space, the sprite will 'slide' to the right. It somehow remembers the direction of the previous behaviour.
Here's a capx if you are interested.
Hope this helps. <img src="smileys/smiley1.gif" border="0" align="middle">