"klebriger Kolben"

I build a high stone dor, that schould open at day. But one block doesn't move. It still leaves in position. If I destroy the block the "klebrige Kolben" goes back in position for an open door. But next time of use it stille leaves in Positon. I think its difficult to discribe it. Maybe you can take a look into the Building if I send you the savegame files.