Alweth

Sounds like a bug. However, before the bug gets fixed, have you tried changing the roof display setting? There's a picture of a roof on the combat UI. Clicking on it switches it between 3 modes. I believe in Community Edition, in contrast with the base game, the roof setting defaults to full roof display, so that might explain the difference.

That page is out of date. Early Community Edition features were brought into Xenonauts proper, but Community Edition still has lots to offer, and I would recommend making it the main version you play. In addition to the changes mentioned on that page, Community Edition has more interesting and varied ground combat maps, more information in the Xenopedia, UI improvements, and some bug fixes and balance improvements.