This is not a bug and is a function of how the system works.


Here is how the Black Market Works: 


The price indicated in the "Highest Bid" reflects the amount of the second-highest bid, which will be paid by the user who submitted the highest bid. The amount paid by the first bid user is not displayed on this page.


In the case above, the 10,000,000 Lada Tokens that you bid remained the second bid, while another user submitted a higher bid. However, since the first bid user is only required to pay the second-highest bid amount, your bid is shown on the screen as the "Highest Bid."