I suspect that the disassembly component display window doesn’t implement scrolling properly, because CDDA doesn’t have a scroll window class and each developer needs to write their own.
CDDA’s UI gets adjusted in bits and pieces. Like a lot of things CDDA, ambitious overhauls tend to result in developer burn-out. This particular bug is on my list of things to fix at some point, but it may not happen before I burn-out myself.
tl;dr: known bug, tedious to solve.
