Why does my iTunes repeat instead of shuffle?

Shuffle songs

Play an album, playlist, or set of songs, then open the Now Playing screen and scroll up.

• Tap  Shuffle to turn on shuffle. The music plays in a random order. Tap  Shuffle again to turn off shuffle.

Repeat songs

Play an album, playlist, or song, then open the Now Playing screen and scroll up.

• Tap  Repeat once to turn on repeat for an entire playlist or album. Tap  Repeat again to turn on repeat for one song. Tap  Repeat a third time to clear the repeat.

If shuffle is on, the  Shuffle button turns pink.

If repeat is on, the  Repeat button turns pink.

On your iPhone, iPad, iPod touch, or Android device

On your iOS or Android device, you can turn on shuffle in two places and repeat in one:

• At the top of any playlist or album, you'll see a  Shuffle button to the right of  Play. Tap  Shuffle to start playback of the music in random order. The color of the button won't change.
• When you play music, a player appears at the bottom or lower-right corner of the screen. Tap the player to open Now Playing, then scroll up. You'll find  Shuffle and  Repeat buttons above Lyrics. The color of the buttons changes if you have shuffle or repeat turned on.
• If your music is playing in random order or repeating and you don't remember turning on Shuffle or Repeat, check Now Playing to see if the  Shuffle or  Repeat buttons have changed color.

Play, repeat, and shuffle music - Apple Support

https://support.apple.com/en-us/HT207230