Live USB - Tails tries to boot but ends up booting into Kali Linux

I have a bootable USB drive with Tails and Kali Linux on it, among others. Kali boots fine. However when I try to load Tails, it manages to get past the Tails loading screen but then the Kali logo appears and freezes, making me reboot. It comes to a screen that looks like this However instead of "kali" it says "debian". Any ideas what's wrong?