I share this computer with my family, and one of them bought this game. When they make world's it shows up on mine, even though I bought this game on a different account, so I don't have enough room for my worlds.
Steps to Reproduce
Using one computer buy Don't Sarve Together with two different accounts on Steam and have one account make a world. Using a different account when at the host game menu there should be the world the first account made.
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.