Hi Breeze,
I think its normal behaviour for Cisco WLCs.
Example: It happend with me.
Old licence was for 15APs
if you add 5 more ap licence to WLC then old Licence will go in inactive state but evaluation License will be in use.
After evaluation period you will get the total 20 AP licence in in use status.
This happend with me.
I think this guy I also have similer issue: https://supportforums.cisco.com/thread/2205144
If you still have doubts or issues then please go for TAC case.
Hope it helps.
Regards