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paul55391 - the new server makes of browser storage (indexedDB) to persist transactional data between sessions, which probably explains why you see different things Safari and Chrome.
And the full features of new server are only accessible on so-called 'modern' browsers (those that are HTML5 feature rich). FX: I know that includes recent releases of Chrome and Firefox, but not Edge - and I'm not sure about OSX Safari.
IIRC it's documented in the Content Server section of the
calibre User Manual
BR