Yes, peening pins it's an art itself and needs a lot of pratice especially with large bore pins. Could it be you buffed the scales w/o pins installed and washed one hole's side?
Looking at the neat design of your knife is evident you got talent and good taste, and so you already know exactly where are the improvement areas in your knife

Filling the pores of your walnut could be a good starting point and you could start it now if you wish.
here it is a nice thread where Michael Rader M.S. explain the technique to treat handles... then just google some of his knives, but wear sunglasses!!
http://www.bladeforums.com/forums/s...-for-J-S-or-M-S-Any-questions?highlight=rader