Hi there, perhaps you restored an item that does not qualify as an artifact in the books total count, but does in the seperate collections. Could be something like a quest item. Not sure if this is intended or not. I would not bother about it too much, as it probably does not affect your gameplay or progress.
Yeah I am just curious what possible item could have caused that difference, given there's already a page for 'others' in the restored artefact list in the journal (which includes some quest artefacts / tetracompasses).
I wonder if anyone is aware about this minor accounting problem LOL