i move one stack of it to a not-complete palisade(means under construction) and next turn,its gone
when i click on it,it says view army and i can attack it, but i just cant move it or even see it
now i`ll try destroying it to see if anything happens

I used to have 200 hc in a game. Can req give them back?

destroy the palisade there is no other way imo

Beside detroying the palisade, you can also try placing another comm stack beside the "stuck" and joining them.