scrollbar changes position

[BeniBela]

Is there something scrolling a TScrollbar randomly down in ws-customdrawn or LCLActivity?

Because I'm porting a program to Android, and it does not work, because the scrollbar that it uses always scrolls down to the bottom/max, so everything is scrolled out of the view and becomes invisible
(also it took hours of debugging to discover that it is caused by the scrollbar and not by a bug in my drawing functions )

edit: nevermind, it was my own function changing it. (and printing the wrong variable to the log, when checking if that function was changing it)

edit2: although the real reason was that GetWindowRect is not working