How can I prevent my map to be flipped in game ?

Exemple in editor:

.....planet 2
......./
....../...............................Sun
...../
..../
planet 1------------------------------------------planet 3


Gives this in game:

planet 1------------------------------------------planet 3
....\
.....\
......\...............................Sun
.......\
.....planet 2

It's really a pain when you try to reproduce something real at it makes the app pretty pointless since you can't use it correctly.