1. It’s bug related with the Auto Key Frame 0. This is reproduce steps.
1) Make rotate.y curve from -19 to -49 (ShotCamera GameObject.transform.rotate.y is -19)
2) Play & Stop (ShotCamera GameObject.transform.rotate.y is 341)
3) Sometimes SLATE overwrite Auto Key Frame 0 with original GameObject ShotCamera. (Or with little rotate.y changes like 341 to 341.01)
So, KeyFrame 0’s y will be changed from -19 to 341. But KeyFrame 1 didn’t be changed.
4) It’s range will 341 to -49