Hello Boopy2, thanks for the feedback!
Sorry about the power pole confusion, I can see it's not intuitive at all. I'll work on improving the tutorial, tooltips and UI to make that clearer.
For the "automatically deleting the last thing you build" part, I'm not sure I follow. Was the situation something like: you click a tile, build a machine, then, without selecting a new tile, you switch the machine type, which removes the previous one and builds a new one in its place? Is that what happened?