iPod touch
I was playing an album on iPod touch GEN seven when it got to the last song it started playing again. But it says slayer show no mercy only played once.
Your Now Playing screen is slightly different to my 6th gen Touch, but either the white three-bar menu button in the lower right of your screen will have additional options, or you drag the screen upwards to reveal the additional controls.
Somewhere there will be the Repeat option. Tapping it may put the player into Repeat 1 mode, so make sure that you have turned it off (by tapping the option a second time).