Kyeskei walks through the portal, then looks around in confusion. There is suddenly much less weight pressing her feet down and her stomach flutters for a moment, as though she is falling, and the walls are all made out of... something grey, not stone, not wood, and when she presses her hand to it, it was never alive. What?

Almost certainly an effect of it being another world, not a cause for concern, just something to find out about. If a world could have a self-editing small-seed that gets inside of people and controls or kills them, without even touching them, there would be nothing to stop the world from being made out of strange materials, or from making everything in it lighter.

She steps away from the portal to allow others to go by.