When I using Abaqus 2021 for modal analysis of the structure, the teacher said that the model has an hourglass, then I encrypted the mesh, and then solved it using C3D8 and C3D8I elements, respectively, and the teacher looked at it, and he still thought that there is still an hourglass at the same position in the displacement map. This shouldn't be the case, C3D8 and C3D8I don't have hourglasses. Can you please help me to determine if there really is an hourglass and if the displacement is of great value to look at the test? The model is in units of mm, the base is constrained, and the cloud is auto-scale (0.07).

Thanks.