sflocolmda.nif and sflocormda.nif have their material type set as "SKY_HAV_MAT_UNKNOWN_1591009235", which afaik is used for ontrigger events for animated meshes? (https://www.afkmods.com/index.php?/topic/3669-overhauling-the-weapon-rack-scripts/page/16/#comment-147976)
If that's not what this mesh is intended for (or if I'm just wrong about that material), the material should probably be "STONE".