Playing a very newly downloaded version of ADOM (3.3.3, release 101) and the overlaid text boxes that allow paging do not properly clear out the previous page of text. So, when I chat with Twyat Pare (the sheriff in Terinyo), the first page of text reads:
"Listen!
Kranach, the raider is still roaming
the countryside.
He's a nasty raider out on pillage.
But when I page down [+] the second page of text reads:
"He's a nasty raider out on pillage.
"Listen!
Slay him and ye'll receive a nice
reward."
the countryside.
He's a nasty raider out on pillage.
As you can see, in the second page, there are 3 lines still displayed from the first page of text. I've also seen this happen while running through a tutorial game in the tutorial instruction 'boxes'.
I'm using the text-only version of ADOM. I think that I also saw this happen in the graphical version.