This is a strange one, bid prices are obviously wrong. All of them are different from the true bid price that you see when you search the AH normally, some other items don't have this problem.

It doesn't show the actual unit bids, it shows the bids divided by your selected stack size. The listing is meant to help undercut stack bid prices to appear high up in the default AH.

You are correct, but prices act strange, am i missing something?

Some more screenshots highlighting strange behaviour

Sorry if i dont understand something

What's strange. Like i just said, they're divided by your selected stack size. (2 in this case)

Check the 2 last auctions on the last picture, the bids are 59.84 & 59.86 accordingly and the stack size of both auctions is one. Now look at the second-last picture. why when i choose stack size 2 do 59.84 & 59.86 get divided by two? what's the meaning of 29.92 & 29.93 ?

It has no meaning beyond being "the stack price divided by your selected stack size"
I just think it's the most useful value to show with regard to undercutting the stack price.

oh okay, i see :)