Point Project With Empty Lists?

Hi, I’m trying to project points from a floor to a poly surface using the point project node. For some reason when I plug my list into the node it produces an empty list for a number of the points. I don’t know what I’m doing wrong. Any help would be greatly appreciated.

First thought: The points don’t sit above the topography in some way. It may be that they sit outside the topo, that the topo has scaled or meshed incorrectly, are above a building pad and therefore fall though it, or that they are below the mesh and therefore fall infinitely below it. Post your files so we can review in more depth.