I Placed A Bid of $2 And The Bid Jumped to $2 Immediately, Instead Of Remaining At $1, Why?
The auction software evaluates the difference between the bid you enter and the next lowest bid to determine whether or not the bid you have entered is a normal, or proxy bid.
It will treat any bid that is more than one increment higher, i.e. more than $1 more than the next lowest bid, as a proxy bid, and will not raise it to this level unless another bidder places a bid that reduces this difference to under $1.
Because $2 is just $1 more than the minimum of $1, it will treat it as a normal bid and raise the bid immediately to $2.