What I was doing: I was navigating the buy/sell pages in the marketplace.
What happened: There is a frustrating bug where, for some unknown reason, the game will switch the buy/sell (Default, Asc, Desc) feature to a random version of the two. I have never needed to use this feature except to correct the bug where the game will choose to move off the default feature.
Link: https://politicsandwar.com/index.php?id=26&display=world
It is just the normal trade page.
Screenshot: None available, but the bug occurs when flipping through the market by resource. I haven't been able to replicate it except at random. What I do is go from resource to resource and flip between buy and sell. Food Buy, Food Sell -> Coal Buy, Coal Sell -> Oil Buy, Oil Sell -> etc. I never touch the default sort feature, but at some point it inevitably will switch it to Asc. or Desc.