Cedar Arbor trouble with splitting posts

I'm building a cedar arbor using 6x6 posts. I ordered "appearance grade" lumber and when it came in fresh and "wet" it looked great. I let it dry in the garage for about four weeks but some of the posts have been continuing to split (check). In some cases the split is going the length of the post and in other parts splitting edge to edge. I expected some amount of checking but this has progressed beyond what seems reasonable. My lumber yard guy said it should have settled to a normal level by now but it seems to have gotten worse since I installed a few of the posts. Any advice? I wonder if I have any recourse with the yard since these posts are turning into anything but "appearance grade" (and they were pretty pricey). thanks, Ron
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These are treated posts? If so, I'd relax as they will ALL split eventulally.
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