ParticleSystem has "Rotation" field in its ShapeModule. When specified rotation is not along only one axis (for example Shape is to be rotated along Y and Z axes simultaneously), particles are spawned in the incorrect position. However, Shape showed in Editor is correct, only after actually playing ParticleSystem, the issue is visible.

To reproduce:

1. Download attached project "ParticleBugProject.zip" and open in Unity
2. Open "SampleScene" scene
3. Select "PlayerLaserRenderer(Clone)" GameObject in Hierarchy
4. Click on Shape module in Particle System component of abovementioned GameObject - do this to see shape calculated by Editor
5. In Particle Effect floating window on Scene window, click Play to start emitting particles
6. Observe that Particles are spawned in the incorrect location

Notes:
- This issue appears on both Windows and OSX

Reproduced on Unity 2018.1.0b3, 2018.1.9f1, 2018.2.4f1 and 2018.3.0a5
Not reproduced on Unity 2017.4.9f1, 2018.1.0b2 and 2018.3.0a6
Regression on Unity 2018.1.0b3