it could be frost jacking. when the surface of the ground freezes it expands and grips the post tightly and pushes it up out of the ground. then thaws and the ground goes back down again. does it again the next year. eventually freeze thaw cycels will push a post up out of the ground. I watched a show on the history channel about the all black army unit that built the highway up to Alaska with junk equipment and hand tools. they used trees for poles on the bridges. to prevent frost jacking they would paint the top couple feet with grease and wrap it with tar paper so the ground could go up and down around the pole. it was a really good show with lots of shots of old Ih dozers working. pretty amazing what those fellows accomplished with very little to work with. I don't think they ever got any real credit for a lot if it.
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