I have a problem with the color of the flames.
In the scene, the flame turns blue and in game view it turns bright pink.
Unity 2021.3.7f1 (DX12)
Visual Effects Graph Version 12.1.7
Thank you for posting this. I tried Ignis with the exact same setup, opened the demo scene and could not re-produce the issue (everything was working normally).
The issue sounds like the Visual effects graph shaders are not compiling. Have you tried re-importing Ignis to your project? Also have you tried to create fresh project with “HDRP (sample scene) template? The issue could also be in your projects HDRP setup.
I hope this helps & all the best,