I do not know how I have done this but I have managed to prioritise several series within my library at some point in the past, but now they are reporting as '0 volumes'

When searching via the passage guide for John 1:6–13 my wbc commentary is not used until I have pressed 'More ...', where it is now item 43 out of 48.
There have been a few resource updates since the prioritisation and the only thing that I can think of is that the meta data for these series was changed and the prioritisation lists did not handle it. When I have the opportunity, I will re-index to see if that nails it but I would hope that prioritisation is not dependent upon indexing (I cannot see why it should be), and if it is not then what have I done?