Contradiction on indexing between the journal and MJL Parallel Computing journal, according to their website, indexed in SCI. However, master journal list (MJL) indicates that the journal is indexed in SCI expanded. Is it possible that the journal moved from SCI expanded to SCI but MJL has not update the information?
Clarivate decides what to index in the Science Citation Index, so their "Master Journal List" is going to be authoritative.  Elsevier's list is likely to be less accurate.