Linuxmint instead of Backtrack

I am runing the latest version of backtrack and gnome 32bit, When i get into the bios menu I have selected the appropriate settings and it then shows me a menu with a couple options:
I am using a LiveCD using unetbootin, I used mac unetbootin to mount the iso onto my usb (does that matter?)
UNetbootin then has this gui:
Default
Start Linux Mint
Start in compatibility mode
Integrity check
Memory test
Boot from local drive
I am very confused as I have downloaded the backtrack iso, why is it giving me linux mint?

I suggest you format your USB and download the Backtrack ISO from the official website. Give it another go with unetbootin as shown on the wiki and see if it works.