Bard bot not singing combat songs

[NickW]

My bard bot is level 32.

He'll sing hymn of restoration, cassindra's chorus, psalm of vitality and anthem de arms while out of combat. Which is fine.

While in combat, he only sings hymn of restoration and cassindra's chorus.. No matter how many different fights I try. No matter how long I wait. He refuses to sing anything else in combat. Just those two songs over and over.

As soon as I leave combat. He immediately goes back to singing hymn of restoration, cassindra's chorus, psalm of vitality and anthem de arms..

How do I get him to sing all four in a fight?