Incorrect deck card # when Ironmorgen reveals Estate

[yed]

After playing Ironmorger revealing Estate, the interface displayed 1 card on my deck, but I had empty deck. The estate can not be on the deck because it is revealed.
This incorrect information mislead me to discard the estate instead of putting it back which caused unwanted reshuffle.

game #5460 on frankfurt-test2
around turn 5?