Operating system: Windows-10-10.0.19041-SP0 64 Bits
Graphics card: AMD Radeon R9 200 Series ATI Technologies Inc. 4.5.13587 Core Profile Context 20.2.2 26.20.15019.19000
Broken: version: 2.91.0 Alpha, branch: master, commit date: 2020-09-04 21:32, hash: rBcf0ba59e311b
Short description of error
According to the official documentation, the Normal option "controls how much velocity fluid is given along a face Normal." but it's clearly emitting from the vertex normal.
Exact steps for others to reproduce the error
Default cube, create a mantaflow smoke simulation. Try to add to the cub the inflow velocity and add normal to a certain value. The smoke is emitted from the vertex.