Voice of resurgence's ability is not working correctly
My own Voice of Resurgence's ability triggers when my opponent casts spells on their own turn. Steps are:
1.) Voice of Resurgence is on the battlefield
2.) Opponent cast a spell on their own turn
3.) Actual: Voice of Resurgence's ability triggers and a Elemental token is created
4.) Expected: The ability shouldn't trigger. It should only trigger on my own turn.