I was working out a setup for a character; I have the character modeled, rigged, and shape keys, and I have hair setup as objects as emitters. The Top/sides hair, eyebrows all work as expected but the mustache is giving unexpected results. The thing is, it looks correct in the viewport but not in the renders (both eevee and cycles). The eyebrows are set up the same as the mustache but they work. I tried everything I could think of. Everything that changes is keyframed (armature, shape keys). Does anyone have an idea what is going on?
Have you checked your Subdivision modifiers for both the Mustache, and whatever it’s bound to? If the view port and render levels aren’t the same it causes issues with the surface deform modifier. You’ll want to check any other modifiers that would change vertex count as well, like masks.
That was the issue. Thanks a lot. All fixed now.