EPUB does not have the concept oif Series as part of the specification!. As a result the readers do not have the concept either.
I am not sure why you are not getting them in Series order on your reader using calibre though? If you send them all to the Device at the same time then Calibre should create the collection corresponding to the series in the series number order. Any sent later are simply added on the end. so maybe this is what you are experiencing?
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