System Information
Operating system:
Windows 8.1
Graphics card:
1070 gtx
Blender Version
Broken:
(example: 2.80,beta)
(example: 2.80, 11f2c65128dc, blender2.8, 2019-01-02)

Short description of error
After some strokes in different placement modes, like origin or stroke, sometime surface projection won't work and instead it is aligned to the view. I still can use Strokes/Transform/Reproject/Surface to correct it afterwards.

Exact steps for others to reproduce the error
Unfortunately i found no exact way to reproduce it yet. It happens quiet often and early in a sessions. i often change grease pencil viewport display modes like from 3d to front and back.