I use a virtual camera to look at and follow my character while she runs in the scene.
The actual running is controlled by timeline.
I also want the camera to rotate slightly around the caracter to see her face when she jumps.
But when I press play, the came camera behaves very differently from the Timeline preview

repro steps:
- download the attached project and open the scene
- in timeline, press play and notice the camera's animation
- press play and notice the difference

Not reproducible in Unity 2018.2 0b3
Reproducible in Unity 2018.1.0f2