I recently installed Kerbal Engineer, and when I tried to use it in my Career mode game I saw that I must buy it in the tech tree. No problem, I went and did that. I went back into the VAB and found that I still couldn't use the parts. Back in the tech tree I saw that the parts were still bought, but a new, unbought set had appeared. [image](http://i.imgur.com/UP6i4k5.png) Anybody know what's causing this, and what I can do to fix it?