Why do I see someone else's bash history when I run screen?

New customer here. Started an Ubuntu 12.04 droplet, and so far everything’s been running smoothly. However, I just ran screen and started scrolling through my bash history. To my dismay, I see curl -L https://{tld ommitted for privacy}.me/cleanimage.sh | bash. This is clearly the bash history of another customer using this machine.

This is quite disturbing. I value security, and if this is the kind of data that accessible in these environments (are they containers?) then I won’t be able to continue using this service.

Can someone please explain this, and fix the issue?

Thanks