It looks like the nd2 reader puts a lot of metadata into the "global" metadata, which should actually be "series" metadata, see https://forum.image.sc/t/position-info-in-nd2-file-can-not-be-retrieved-correctly-by-bioformat/ .
"Besides dPosName, lots of other parameters should also be in the Series metadata as they are different for each series, for example, dPosX, dPosY, dPosZ, etc."
It looks like the nd2 reader puts a lot of metadata into the "global" metadata, which should actually be "series" metadata, see https://forum.image.sc/t/position-info-in-nd2-file-can-not-be-retrieved-correctly-by-bioformat/ .
"Besides dPosName, lots of other parameters should also be in the Series metadata as they are different for each series, for example, dPosX, dPosY, dPosZ, etc."