When you have to choose a printable and if you won't choose anyone (and won't reject printables) and go to main menu, then loading save again the printables will be different. I'm pretty sure that it's exploit and you should fast change it because this bug is from 2 weeks :/
Steps to Reproduce
Wait for printables, remember printables, go back to menu, load save and see that the printables are different.
Status: Known Issue
We are aware of this issue and have it logged internally but either we do not have a fix ready yet or we are not planning on addressing the issue in the immediate future.