1. That is not a bug, it only places it at the center of the brush, because it does more checking as it doesn't have to stay on the 4x4 grid like other walls.
@MM314 they are the channels. they show where they are connected, and where the particle will teleport.
Edit: The shenanigans combo key (i said shenanigans cause i think i get banned if i say it) arent working anymore... the menus just dissapears, but no cracker menu... D:
@The-Fall No high if you type in console set life deut -1 or larger color it will be like that. I think it's just a trick with seting life so it's not a glitch.
The gray lines are like wifi lines. Portals can be changed in different channels, so those lines show which portal is connected to which. I find them quite helpful, actually.