A single audio clip is playing through automation clips and other audio tracks when isolated.

[spice berry]

Link to reddit post:

https://www.reddit.com/r/FL_Studio/s/0h7RVw5ymI

[chilly forge]

you have an edison on the master insert that has audio inside of it. this Edison is linked to playback. go to your master, and you can remove the Edison

or you can tunr off playback link in edison

[spice berry]

Thank you @chilly forge