It seems like you have not changed the -50 degrees angle.
In Construct 2 the angles are:
North: -90
West: 180 <-> East: 0
South: 90
The movement of the angle stays the same when space bar is pressed the sprite will move from it's relative position. So "East" becomes "West" when mirrored.
Hope that helped.
Can you take a look? I need the movement of the sword to be the same. The right swing is correct. Need the left swing to do same but facing left.