Other mistake: Arabic inscriptions can be seen on the golden desk, but the letters aren't connected like normal abjad. This is likely a computer rendering error since some editing software don't natively support foreign characters. (00:17:10)
Other mistake: When Vlad is in the armory of the monastery, he is standing directly under sunlight. This should have caused his skin to burn immediately and give away that he's a vampire. (00:52:05)
Answer: Well I just saw it so I thought it was melted down to be used to defend themselves if one would appear again. Or they melted it because he was thought to be the evil and they didn't want to honor him.