I finally figured it out
My folder structure is as follows:
Rock\
Reggae\
Bob Marley\
1973 - Catch A Fire\
Disc 1\
files....
Disc 2\
files....
If the structure above is used then all albums appear as albums, however if the following is true then the albums appear as artist (or they do in my case)
Rock\
Reggae\
Bob Marley\
1973 - Catch A Fire\
Disc 1 - Studio master\
files....
Disc 2 - Unreleased Jamaican Version\
files....