Dear Sheela Devi The title "Materials today proceedings" has no impact factor since it is not indexed in Clarivate's SCIE/SSCI index https://mjl.clarivate.com/home
The other reason for the discrepancy is that there is quite some discussion on where this is a journal or a conference proceeding: https://www.researchgate.net/post/If_a_paper_is_published_in_a_journal_via_conference_does_it_count_as_a_conference_paper_or_a_journal_paper