Hi, I just recently built a deck and put the footings post into concrete filled holes. When I installed them it was very dry and recently we got a lot of rain and the posts have shifted up about an inch or so. This happened within months of putting the post into the ground. It looks like the posts have shift out of the concrete instead of the concrete shifting up also, based on the fact that I can see the line on the post where the concrete had been filled up to sitting a half inch above the concrete. I realize I probably didn't take enough precautions when putting a wood post directly into concrete but I was trying to figure how why the shift happened and if it will eventually settle back into place.