Siri selects wrong radiostation to play on HomePod

I use my HomePod to play radio using "Hey Siri, play Radio Veronica". This usually works fine. But since yesterday Siri plays Radio Veronica Rock Radio, which is a different radiostation. Why is Siri responding differently on the same command?

I do not have a Apple Music subscription. And Siri automatically plays radiostations via TuneIn. Even asking "Hey Siri, play Radio Veronica via TuneIn" doesn't work.