There is a known bug with FOLIO connections to ILLiad via Z39.50. Passing along attributes related to serial volumes and issues seems to be especially affected. There is no known soution at this time.
Atlas addresses this here: https://uservoice.atlas-sys.com/foru...tions/47672348
FOLIO addresses this here: https://folio-org.atlassian.net/browse/ZF-67