With Daz, there will be discrepancies between Texture Shaded, Iray Preview, and the final Render. For example, hair that only shows up as lines means it generates the rest during rendering. You'll see this a lot with fur because there's no sense in spending a ton of resources in Texture Shaded to render every single strand. You only care about what areas the fur would cover which is what the preview lines are showing you.
No matter what you see in any other view mode, you're golden as long as it looks correct in the final render. If something feels off after a change, do a quick render (like 100 iterations max) make the change and do another test render to compare.