Roster problems were addressed in the early fall of 1864, boys in the 3rd and 4th Alabama Reserves being transferred to the 1st and 2nd Alabama Reserves. Most of the issues involved the 3rd Alabama Reserves, if I recall.

Revelvant correspondence regarding junior/senior reserves from Alabama and other states will be found here:
The war of the rebellion: a compilation of the official records of the Union and Confederate armies; Series 4 - Volume 3

Available online here:
http://ebooks.library.cornell.edu/m/moawar/