Here are some gifs that demonstrate the issue:
Attempting to sidestep to the right while using a fallen tree as cover. Note the character's legs animating as though he is running to the right even as he moves left. The "D" button on keyboard is held down for the entirety of gif.
https://www.dropbox.com/s/j2qa9tmatl3n3lv/sidestepping%20wrong%20direction.gif?dl=0
Attempting to sidestep left and then walk backward causes character to strafe right and then walk forward, entirely clipping through the log.
https://www.dropbox.com/s/dgik5wvfpoyd3pw/Clipping%20thru%20log.gif?dl=0
Running up to a tree and then pressing "D" on keyboard with intent to sidestep out of cover to the right. Character initially moves left instead of right; once clear of the tree, movement returns to normal and character begins correctly sidestepping to the right.
https://www.dropbox.com/s/hl3lkw95fo8sqst/peeking%20wrong%20direction.gif?dl=0
Approaching rock and then attempting to sidestep to the right. Character moves left until clear of the rock, movement then returns to normal and character strafes right.
https://www.dropbox.com/s/6yt61fte7vcacr5/rock.gif?dl=0