Weird result

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Weird result

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Hi, for some reasons I cant get the builtin Nand chip to do what I want. Creating my first not and or gates is failing. Ive posted imaged to screenshots below

Its really weird to me that the builtin Nand is sometimes returning 1 when both inputs are also 1 and other times it returns 0 when both inputs are 1.

Is this a bug or am i doing something wrong?

EDIT: Nevermind! my mistake was that i didnt click the EVALUATE button after changing the values. Ive removed the screenshots since they contained working answers.

This tutorial saved me: