I have seen various times on meta that up vote on meta means you agree and down vote on meta means you dis agree.
But the tooltip for up vote says
This question shows research effort; it is useful and clear.
(Not I agree with the idea in this question)
and tooltip for down vote says
This question does not show any research effort; it is unclear or not useful
(Not I disagree with the idea in this question)
So why do people keep voting for agreeing or disagreeing and keep saying voting is for agreeing or disagreeing on meta?