I have recently used AS_TimerPicker lib from @Alexander Stolte
My first development was under B4A (B4xPages). When I tried this lib on B4I, the touch event over the hours/minutes do not take effect.
It´s strange as dragging the Thumb object reacts to the move event, for the touch it does not move it, so there is not a problem of object being on top of it blocking the "event" capture.
I think that it works if you keep pressed the hour/minute a little bit longer, not just the same behaivior in Android, that with a "click" it selects the time. I assume it is maybe because Touch event consume are different in each OS.
I will try to check in my App, adding as a local class instead of the Lib in order to debug.
if you take an empty project and only use the view, does this also occur?
if not, you should tell me which view you are using below, otherwise we won't get a solution