I think Mak hit on your problem.

unless explicitly bound, shift-w = w, ctrl-w = w, alt-w = w etc

so if you have w down and press shift-1 then shift-w could also be sent.

NOTE: Wow reads keystrokes as a key down and a key up.

so this shift-w will be read by wow as shift-w down = run forwards

however after you have finished with shift-1 and released both, then only the w key is held down... letting go of it will send the w up to the client which is blocked by keyclone because w is on the DNP. The clients never receive the shift-W up keystroke and so continue running forwards.

SOLUTION (I hope)
add all modified versions of wasd to the DNP list