Issue with next/previous and page number navigation of folders and collections

I have a site running Plone 4109 where if we are paging through the contents of a collection, which is sorted by Creator, alpha ascending, the paging functions correctly up until the Creator names starting in K. As soon as we pass K, it jumps to the S names. Once on the S names if we keep clicking Next or the next page number, it stays on the same page of S names for several clicks, then eventually jumps to the end of the alphabet.

The Next/Previous and page number buttons for moving between batches, as well as the view All button also behave erradicaly, or 'buggy' when using them in the Folder Contents view.

Any advice or insight you can provide would be greatly appreciated!

Thank you,