Address a focus or scrolling issue when using keyboard navigation

Using the arrow and other quick navigation keys with a screen reader such as JAWS for Windows to navigate a reading list which is organised by weeks or topics. The content seems to auto-scroll and unexpectedly change screen reader focus. When I realise it has skipped something, pressing the up-arrow key once to go back, the focus is on an altogether different position in the list. Even heading level navigation forward skips some content, and then pressing shift-h to go back by one heading moves focus to a totally unrelated heading. The above makes it near impossible to use the reading list.

Please could you address the focus/scrolling issue.