Hello Emma,
The dimensions of 1,348,321 x 19,362,288,093 pixels and 1mm resolution doesn't seem to be correct. It means that the area of reconstruction is 1.5 x 20 000 km - it is several times longer than Australia dimensions.
Are you using imported dense cloud as a source or it is the result of processing in Metashape? In the latter case, can you please send the PSZ project with the alignment results and referencing information only to support@agisoft.com?