Currently in the auctions list:
A Blade of Thuringwethil [73x90] (+0) $578,813 $1,603,500 21:21:04
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Actually clicking the link shows the following:
Details
For sale by auctioneer
Ends in 21:20:30

Net worth: $704,193
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So $1,603,500 becomes $704,193

I noticed something like this when the Junction Amulets got changed to +10, but I assumed it was because they were all upgraded. Now it seems there is a bigger issue here.

Mine seems fine, you sure you didn't mis glance.

interesting, mine shows the same:

Net worth: $704,193
Net worth is a measure of how much has been spent on upgrades, not of market value.

I refreshed the rare items page, and the listing still has a NW of $1,603,500.

Now $704,193 seems to be the correct NW of a Blade of Thuringwethil at x90. So I'm not sure why I'm seeing such a higher NW value on the Rare Items auction listing.

I'll check it out at home in about an hour.

yeah, I bid on an AoJ 7k NW but after I won it, It turned to 1.4m

Here's what I'm seeing on the auction listing page:

A Blade of Thuringwethil [73x90] (+0) $578,813 $704,193 20:56:03

Is what I currently see.

Interesting, I see it as $1,603,500 also.

$1.6 Mil is showing on mine

Why is auctioneer selling an x60 BoTh anyway?

I also see 1.4 mil NW on rare items and 700k on the auction page.

Umm, I cleared my cache a few days ago, maybe this has something to do with it, why don't you guys try this?

When I click on the rare items link I see 1.6mil but in auctions ending soon I see the correct net worth.

added to the ever-growing known issues page of the wiki.

This is not a bug - issue removed.

The BTH was rescaled before that item left auctions. If any current auctions display this, then open a new bug.