First: I choosed Random as reproducabillity because of the Walls from the watchtower.
1. BAD TRIGGER: You have to stand DIRECT in the middle of the watchtower to Build the "LevelBases", otherwise youre not able to build the LevelBases. I moved around and tried from other Angles, and one solution i found was standing with my back to the "log" and turn my head ( watch over my shoulder ) to reach the trigger. This only works for the ground level. For the other levels is Only standing right in the middle.
2. WRONG BUILDING/DESTRUCTION PART: In Some cases it happens that the wrong part is destructed or crafted. I were on the SecondLevel of my Watchtower and crafted the Bases of Wall_1, moved over to wall 2 (there i started with the top Base first, on Wall_1 it was the BottomBase). I noticed that it really looks nice when the bottom part is away, so i stopped building the Top Base of wall 2 and moved back to wall 1. I tooked my "WoodenAxe" and started to destruckt the bottom part but it erased me the top Part. So i wanted to build it back. I moved nails and planks from an other level (i dont know anymore, sorry) and started crafting. But instead of building the top base, it planked me the lower base with planks. So i thought ok... This is DayZ ^^ Move Over and Build the Other walls before you get shot ^^. Back on wall 2 i started crafting the topbase --> Worked. So i thought it has to be a Single Event, or i missclicked. On wall 3 i willfully first builded the Bases and taked the bottom down base away... (wanted to see if it looks cool when the bottom part is away hehe (no planks attached, only framework) Then, i swear, i 100% Clicked On Build down base (had to click 3 times until it shows me this) But it planked the Top Base. And i know it was "build bottom base" because i read it out loud to my friends. This thing happens randomly, but mos of the time when you not finish building the bases, switching items within the levels or build the top/bottom base of a wall and switch to another wall and build there a base or plank a wall... Maybe it is reproducable with barbedwire attached on the baselevel, because i attached it completly on wall 1 with a Camonet!
3. GATE TRIGGER: I Crafted a Fence with metalplanks and turned him into a Gate. Opening is Easy from inside, but you have to stand a bit away from the gate though. Closing it from Outside is a bit tricky but not impossible. You have to stand a bit right from the outside of the opened Gate to close it (looking between the metalplank and the "base" of the fence.
Closing from inside is impossible. Could not close it in 6 hours of gaming (i crafted 4 on several surfaces).
I Hope this help you guys out!