, keep in mind that the varnish coat might be slightly uneven, and it wouldn't take much to throw it off cause of different moisture content.
Explain that to me? You lost me.
I think I'm with pearl. Unless the change where it was originally stored and sealed is significant it might take a little longer to equalize if one side is sealed better but equal is equal. They will both end up the same as their surrounding. From what I hear, no seal is completely water/moisture proof.
And to the original poster, is it possible the sun hits part of the bow at some point in the day thru a window? I'm with the others. it sounds like something is heating it somehow or it wasn't seasoned enough. Or possibly elves. Were you drinking when it was strung last time?
No drinking involved lol the bow is hit by the sun part of the day but I don't see that doing anything other then darkening the Osage wood
Well, that could in fact be your problem. Direct intense sunlight is bad for wooden bows, especially laminated bows. It's one of the first things I tell people that will void their warranty. I've had more than one person bring me their bow that has delaminated from leaving it in the direct sun, like inside a closed car. It will do more than darken the osage.