Something in your settings is wrong. When you loaded the print into Simplify3D, did it look like this?
If not, the machine settings are definitely wrong, as the cylinder outline showing the print volume comes from that. Check the process settings and make sure the Flux/Delta profile is selected.
As an example, that same benchy that was loaded into S3D loaded into Flux Studio without any issues:
And you can try the g-code file if you want to see if it loads for you fine, or if there is something else wrong. It's based on on the last optimised profile that Luan linked, but I havn't used it yet so I don't know how it goes with my machine!