I'm new to this game, so chanced are high this is a feature rather than a bug.
My understanding is that the soul whip effect gives all my weapons a purple glow when my focus is below max.
Even though that effect was present at the beginning of the game it is completly gone now.
You can see the following things:
1. Focus < Max
2. No purple glow
3. Soul whip is active (the focus increased on the third image)
4. My head glows purple when I engage into a fight. (not talking about the halo).
OS: Windows 10
Version: 3.05.1186 steam