Problem with 700 series AP maximum transmit power

I have over 100 700 series APs installed in several locations. Al the APs are in the same WLC (same running image). Almost all the APs are in FlexConnect mode. TheAPs are powered thru PoE provided by the switch. All the APs have the same allowed bit rates (wireless->802.11b/g/n->Network).
In some APs, I can configure the interface dot11Radio 0  with power local 14
In other APs, I can configure the interface dot11Radio 0  with power local 20
The APs bellong to the same AP group.
Why is this difference in configure power and how I can fix this?

Available Transmit Power Settings
2.4 GHz
20 dBm (100 mW)
17 dBm (50 mW)
14 dBm (25 mW)
11 dBm (12.5 mW)
8 dBm (6.25 mW)
5 dBm (3.13 mW)
5 GHz
20 dBm (100 mW)
17 dBm (50 mW)
14 dBm (25 mW)
11 dBm (12.5 mW)
8 dBm (6.25 mW)
5 dBm (3.13 mW)
Note: The maximum power setting will vary by channel and according to individual country regulations. Refer to the product documentation for specific details.
http://www.cisco.com/c/en/us/products/collateral/wireless/aironet-700-series/data_sheet_c78-726725.html

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