Hair shortens when rendering.

When previewing the render in the viewport I get the left render. Then, I render using F12, then either after the render finishes or I stop it with ESC, I get the right render using the viewport preview render. I can’t figure it out. Any suggestions?

I’ve already applied the scale of the model. I also added these particles with the “Add” tool in particle edit mode and also cut and grew them using the appropriate tools in particle mode.

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may be the add you made is the problem, because if your using the subsurfe i would say it,s the problem