Rigid bodies interacting incorrectly

Im attempting to drop a sphere on a turbo compressor wheel and i want the sphere to "roll" down the fin it hits. instead, when it falls its like it hits an invisible box that's near the comp wheel and shaped differently. Both are set to rigid body. sphere is active+dynamic. Comp wheel is passive+animated+convex hull. Bakes have been deleted. Pulling my hair out on this one. Blender file in google drive here - https://drive.google.com/drive/folders/1zhvlhD4nIpycrLnSardnUnzUsUVIx4kS?usp=sharing