[X] @deustp01, I think there is a curation error in Reactome R-HSA-163625. The glucagon receptor in mouse is Gcgr (MGI:99572; UniProtKB:Q61606). Its human ortholog is GCGR (P47871). That's also the gene that links from the Pubmed page for the Lok S et al, 1994 paper cited in the Reactome blurb (PMID:8144028). Can you double check the annotation to UniProtKB:Q9NS75)?
Agreed - P47871 is correct; Q9NS75 is wrong. Fixed in internal db; will be visible with December 2022 release.