First off---- what version of the game did you build that with ? The map specifically. Was that something you had in your files for years? That is the only way I know of to produce this repeating tile pattern is to have built that map with a very early version of the game
THIS is what clear terrain looks like with the latest version
.....and ALL of the aircraft came in diagonally from the top left to the bottom right the three times I ran it.
