Library not alphabetical

I have 2 references that will not fall into the correct place when I sort by Author in my library.  I have tried to change the sort option defaults and I have tried to edit the author names, but to no avail.  Can anyone help me so they fall in alphabetical order? As you can see in the attached image, ‘ARDS’ and ‘Blood and Marrow Transplant’ are the two files that do not fall alphabetically.