Page Up/Page Down functionality broken after Home/End press

Page Up/Page Down seem to have completely separate handling from the Home/End keys. When I use Page Up/Down to scroll to the middle of the page, then hit Home/End, then try to use Page Up/Down again, the page jumps to one page above/below the previous Page Up/Down location. Expected and desired behavior would be for it to just move one page from the current location, not from the last remembered Page Up/Down location.