If you edit a base facilities storage capacity by a mod during a running campaign the game's storage system will go berzerk:
-Spare tanks in your storage will dissapear after your defenses repel a UFO
-You (sometimes) will be unable to quit the "You have too little storage room" message screen even if you sell everything which means your game is fubar
Not sure if this could be considered a bug, but at least it is worth warning others I guess.