Joan, not "taking the piss" here - but I'll try and simplify it as much as possible.
Basically it's all down to the 'current high bid' level rather than what others have placed.
Lets say opening bid is 1p.
You place a snipe/last minute bid of 80p over another bidder, you will still win even though you have only bid 80p more than the current high bidder, as you still meet the requirement of placing a bid of 'one full increment' over, because even though the other bidder was before you, the current high bid was still only 1p.
If however the opening bid was 49.99 and someone had placed a bid of 50.77, your bid of 50.80 would not be accepted, because it is not one full increment over the current high bid of 49.99
This is the case no matter how many bidders there are or what their highest bid is - it's purely down to what price the 'current high bid' is and your ability to place a full incremental bid over that.
hard to explain 'on paper' as i can't see what faces you are pulling to what i've written above lol