sonotubes most commonly come in 4 ft lengths and should be placed in the ground the entire 4 ft length which is below the frost line. in your case the way your describing this issue they most likely hit ledge and stopped there leaving the rest of the sonotube sticking out of the ground. what should have been done after determining that it was ledge is called pinning. very common practice in New Hampshire. We use a powerfull hammer drill and drill into the ledge and then use rebar with an expoxy to hold done the post. also we would use 6x6 post. if your ready to do this project pm me. we are starting a 8 week project very soon. best of luck.
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