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Can someone explain to me why Dragon's Grasp (1d6) seems to do more standard DMG than a Handaxe +1 (1d6+1)question

Shouldn't it be like in the blue markings? Dragon's Grasp should only do 4-9 instead of 5-13 standard damage with the main hand and 1-6 instead of 5-10 standard damage with the off hand?