Black Lion store bug
You can check to see if it has been added to the Known Issue Tracker. It might be on there, but is no indication the Devs are not aware if it is not. There have been plenty of posts/threads about the issue. (See Sticky above.)
Good luck.
Has anyone looked into the bug with the Black Lion Store where it will randomly popup the minimum sale price even though the current buyer price is way higher? With the price bug it is easy to accidentally sell something way below it’s current market value.
I’m still getting the bug where it will randomly popup the message about HoT validation if I sell items to quick even though I have HoT.
It’s some sort of latency between client and server. It doesn’t affect everyone and those whom it does affect don’t experience it more than rarely. If you want to add a little extra effort, it can be avoided entirely by creating a custom sell offer (even one a few ‘pennies’ above the highest buy offer).
Be sure to /bug report it in game if you run into it, so ANet has the data they need to troubleshoot and if you lose more than you can afford (whether 10s or 10g), file a support ticket, too — there’s a decent chance they can make you whole, if you can provide date/time and numbers.