Magic: Magic invisible polys

[Adonnay]

I know magic isn't really supported, but I'll ask anyway.

Well I have a strange issue with some invisible polys. As you can see on the screenshot the vertices are still visible but not deletable in any way. Weird thing is the polys (I tried a drop shaped cockpit earlier) do appear in the game... looks a bit odd as you can see :/

How it MIGHT have happened: I selected the cockpit and defined it as a surface, locked and hid it for editing purposes (I wanted to try another cockpit so I hid this one in case I wanted it back later). Then I decided to keep the new one and discarded the surface... well any ideas? This really messes up my fighter up :/