Turn signal control Arm problem

turn, signal, blinker, back, fluid, problem, control, worn, easy, changed, stays, left, make, works, fine, automatically, straight

Im having a problem with my turn signal control arm. when i turn it on (only going left), make the turn, everything works fine. When i get back from the turn to going straight, the blinker stays on and doesnt automatically come off like it does normally? Is something worn out in there? is this an easy fix? Oh, and i changed the blinker fluid out the other day, does this have anything to do with it? Should i put the old fluid back in?