Thanks for reporting this bug, ShaiyaCat.
As you witnessed, obviously something went really wrong. It went so wrong, that I can't even reload that game to see what happened (it gives an internal error). Would you be kind as to confirm/answer a few questions:
1) I assume that was a 5 player game, and all players were affected?
2) I assume that the game did not start that way, but that bug happened after some playing time?
3) I assume Black Market was played often?
4) Can you list as many of the Kingdom cards that you can remember (Sentry anf Black Market you already mentioned)?
At the moment, the usual suspect is Black Market, which is known to cause trouble when the Black Market deck is reshuffled, but it may be something else, of course.
In the future, when you find another bug, it may be better to post about in the bug forums (http://forum.shuffleit.nl/index.php?board=12.0
), this one could go in "Other Bugs" or "Interface Issues".