Most likely the shifter cable just needs a small adjustment. First thing to do is to SLOWLY (while you are riding) tighten the barrel connecter at the top of the cable (usually where the cable comes out of the shifter and goes into the frame cable stay. Again make a small adjustment and it should correct. If this does not solve the problem try adjusting the rear deraileur high and low adjustment screws (just a 1/4 to 1/2 turn at a time to adjust.
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