[Koha] Series in order

We have several large series and I have not been able to catalogue the books in order meaning the barcodes are not in order either. When the series is searched the titles are not in issue order. An example is the Seven Sister series. When searched the titles appear as book 1, book 7, book 4 etc. I put the series title into 490 a and the series number into 490 v. I have played around with this but it still does not work Is there a way to have the list in the series numerical order so we can advise on the order the books should be read? Thank you for any help Angela Davies Opawa Voluntary Library Christchurch New Zealand