To reproduce:
1. Create new project.
2. Create Particle System.
3. Enable "Force over Lifetime" module.
4. Set "Force over Lifetime" to "Random Between Two Constants", where first constant is (0,0,-3) and another (0,0,-5).
5. Check "Bounds" to make particle bounds visible.
6. Open Scene window, with Particle System selected so it's Simulating.

Expected result: Bounds are drawn around particles.
Actual result: Bounds are in the wrong position.

Reproducible:5.6.1p1, 2017.1.0b8, 2017.2.0a1
Not reproducible: 5.6.0p3 (all particles are inside bounds (good), but bounds are too big).

Workaround:
Enable one of these modules: Limit Velocity over Lifetime, Rotation by Speed, External Forces, Noise, Collision, Triggers, Sub Emitters, Trails