Because kriemhild and brunhild had a quarrel. Kriemhild reveal these gifts to prove that brunhild has been unfaithful to her husband and allowed siegfried to sleep with her
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Kriemhild revealed the gifts to Brunhild to assert her own superiority over her. By displaying the gifts given to her by Siegfried, Kriemhild was trying to prove that she outranked Brunhild in terms of wealth and status, ultimately sparking the feud between them.