nope the pricipe of bidding is clear and you couldn't complaint about this

to qualify to next round you need to bid at current round and it finished only if there is only 1 or 0 bidder

the winner is one of these 2 case,
1.the only one who bid in a round
2. no-one bid and you are the last bidder in last round

in your case, your opponent is the only one who bids in the knock out round 1