This generator is currently in very early alpha. A lot of stuff has a ton of bugs, works incorrectly, or just doesn't work at all. For now I'd recommend not using the individual delete buttons on the vertices, because who even knows how the spaghetti code there works. Other stuff should be mainly stable, but there's pretty much an equal chance it all breaks with one click. If you find any bugs please report them to me on discord (DrBracewell#0252) and I'll get them sorted out as soon as I can :).
You can click in the code then use CTRL + A -> CTRL + C to copy it.