[suzeeq]

You probably did some incs on one round where you weren't supposed to. Figure out which side of the back or sleeves that you did that, and skip an increase at the same raglan next time. That may be less conspicuous than a decrease, and being a stitch over in the plain section is okay anyway - at that gauge it's not going make a difference in size and no one's going to be counting the stitches...