You mean the Alien-Raid-Missions on the Geoscape where you get either Money, Scientists or Engineers. That´s no Bug, it´s a complete new Feature which upgrades the Geoscape a lot and are a must have to make the Game interessting.
It´s one of the special Features the Devs announced. But it was already mentioned in an Version-Log (V.18.0 if I remember me correctly).