I just cannot imagine that anyone who has ever participated in an auction would think that a bid on one item would extend the time for bidding on other items. Never seen that in my life.
This has happened on at least one other recent auction I've taken part of - it adds chaos for bidders and has been an obvious headache for sellers.
Of course the bidding on one item should only pertain to that item. I don't know the seller/creator, but from an outsider looking in, this just looks like a greedy dishonest move.
This was not my take, rather felt like it wasn't clearly thought through.