I've done some combining and got it down to two listings but can't seem to get these last two combined. One has the work ID 171008108 and the second has the work ID 215174067.
The problem here was, the main edition of work ID 215174067 was missing the period after the "Jr" in the author name field. Only works under the same author profile can be combined (or at the very least, the main editions).
Thanks for your help.