In Compensation History Data under all periods is same for all fields.
Reproducing the Issue
Go to the worksheet of any Planner --> Open the profile of an employee --> You will see that under Compensation History --> Data under all Periods are the same.
Go to Admin Center --> Compensation Home --> on the right side top select 'Action for all Plans' --> Select Action for All Plans
Select Compensation Profile Tab, you will see that the the Compensation Plan selected for all the periods configured is the same as shown below,
You will need to select the respective year plan for those respective year template. Then data will be pulled in from different plans.
KBA , LOD-SF-CMP-ADM , Admin Tools, Settings, Permissions , Problem