I edited this edit:
https://www.wikidata.org/w/index.php?title=Lexeme:L287892&diff=1146657050&oldid=1138917311
You can see in the edit summary that I sent two claims of the property P31, but only the second one was actually added to the lexeme.
(The edit was done through User:Okkn/jsonLexeme.js but the same issue happens on python)