[ganbatekudasai]

Ah, I think it's just a misunderstanding, then.

Confidently != consistently. If I walk up to someone and say "there are lots of ripe apples on the tree outside, I'm going to run out and grab some", then that is me confidently stating that there are ripe apples on the tree outside (regardless of whether it is true or not). But if half an hour later, I say the opposite, or even just don't mention it at all anymore, then I haven't done so consistently, even if I was saying it confidently before.