System Information
Operating system: Windows-10-10.0.18362 64 Bits
Graphics card: GeForce GTX 1060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 436.30

Blender Version
Broken: version: 2.81 (sub 12), branch: master, commit date: 2019-09-23 15:18, hash: rB14acac0bb7f3

Short description of error
In the RGB curves node it is possible to set multiple points to have the same x location. In that case Blender seems to decide which one is the first in the curve.
Every time the same value is used, Blender cycles through the points to decide which one comes first.

The current issue is that when rendering it seems to now also cycle between the points every time.
There is one of these instances in the Spring Splash Screen and Spring Benchmark render that result in her jacket turning pink every other time it is being rendered.

While this is also a mistake by the user, the order of the curve points that Blender decided on should not change every time it is being rendered.