2 DSMs stay the same after changes in the landscape

I’m new to pix4d and I’m trying to compare the heights of DSMs from 2 different months. In the first month the situation is as it was and in the second month an artificial dune was placed in the landscape. However, the results of the DSMs remain the same after this change in the landscape, as if the dune is not included while the DSM is being calculated.

Does anyone know how this is possible? And what should I do differently so that I can make a correct comparison between the months?

Hi Bas,

Welcome to the community.

Are you able to share the projects?

Thank you,