[itimpi]

If you copied the books at the OS level this is expected behaviour as Calibre avoids altering any file in the library unless it HAS to.

If you export the book using "Save to Disk" from within Calibre then the exported copy will have the metadata changed. Metadata is also updated on the copy sent to a device using the "Send to Device" calibre command.

If you want to have the copy actually stored within Calibre to have the new metadata embedded in it, then run a conversion where both input and output are the same format.