Walt contradiction?

Late in S1 Walt says to Locke "Don't open that thing Mr. Locke, don't open it!" or something like that

Then early in S2 when Shannon sees him wet in the jungle, he says "bad button" when played backwards. Don't quote me on these but I think they're pretty accurate

SO at first "Walt" wants Desmond to keep pushing the button because by saying "don't open it" he's essentially saying he wants things to remain as they are

But once they're in the hatch wondering whether or not they should push it, why would he say "bad button"? Wouldn't that be motivation for them to NOT push it? I've always attributed this quote to MIB because he wants the energy released; but the first quote I mentioned doesn't go with this. Can anybody clear this up?

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