Stacking Cisco Switches

I've experienced an issue twice now where I was stacking a WS-C2960X-48FPD-L and WS-C2960X-24PD-L where when the stack is turned on, the WS-C2960X-48FPD-L configuration will show two of the same model switch, and the 48 port switch will be switch 2 rather than the first switch

Before:
version 15.2
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname XXXXXXXXXXXXXXXX
!
boot-start-marker
boot-end-marker
!
enable secret XXXXXXXXXXXXXXXXX
enable password XXXXXXXXXXXXXXXXX
!
no aaa new-model
switch 1 provision ws-c2960x-48fpd-l
switch 2 provision ws-c2960x-24pd-l

After reloading the 48 port:
version 15.2
no service pad
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname XXXXXXXXXXXXXXXX
!
boot-start-marker
boot-end-marker
!
enable secret XXXXXXXXXXXXXXXXX
enable password XXXXXXXXXXXXXXXXX
!
no aaa new-model
switch 1 provision ws-c2960x-48fpd-l
switch 2 provision ws-c2960x-48fpd-l

The 48 port becomes switch member 2, and the 24 port is not active within the stack. The rev of the ios was 15.2(3)E at the time. The stack was cabled as shown in figure 4 on this guide:

http://www.cisco.com/c/en/us/products/collateral/switches/catalyst-2960-x-series-switches/white_paper_c11-728327.html

Any explanation as to why it would cause this error?