Why are these tracks connected

I have an audio vocal and I wanted to make and Omnivocal harmony. I used the var-audio to make a midi track, but it didn’t align well when I made the vocal. I deleted and went over the variaudio more carefully snipping at syllables, where needed I extracted the midi and then went to drag to the Omnivoacl track, like before.

but now when I click it, the originating vocal track also is selected and so I can’t drag it. I don’t know what made them inseparable. Aslo if I try to delete it to start over, the original vocal will also be gone!

I’m not at Cubase so can’t be too specific. But there is a Group/Ungroup command, maybe in the Edit Menu. It is typically used to move multiple objects around as a single item.