Comment (by Pedro Espino):

I can confirm that both objects begin at the correct locations (i.e., the same as BAM) on the grid. Below is a view of the trajectories on the equatorial plane for each evolution code (ET is EinsteinToolkit and BA is BAM). We’ve tried this test with both the VolumeIntegrals_GRMHD and NSTracker thorns for tracking the NS, and they result in similar results. I suspect the differences in trajectories are due to different gauge conditions. It is difficult to get a 1-to-1 overlap in the gauge conditions between BAM and ML_BSSN.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2619/include-ellipitca-reader-in-einstein