Logic utilization different between Partition Statistic and Resource Usage Summary

Hi,

Anyone knows why the SUM of logic utilization in Partition Statistic is NOT EQUAL to logic utilization in Resource Usage Summary in Fitter report? Bug?

52,714+64+81=52,859 not equal to 52,258.

Seen this in..

Quartus : 15.1

Device : Arria 10

+---------------------------------------------------------------------------------------------+
; Fitter Resource Usage Summary                                                               ;
+-------------------------------------------------------------+-----------------------+-------+
; Resource                                                    ; Usage                 ; %     ;
+-------------------------------------------------------------+-----------------------+-------+
; Logic utilization (ALMs needed / total ALMs on device)      ; 52,258 / 427,200      ; 12 %  ;
; ALMs needed                                         ; 52,258                ;       ;
+-------------------------------------------------------------------------------------------------------------------------------------------------------------+
; Fitter Partition Statistics                                                                                                                                 ;
+-------------------------------------------------------------+-------------------------+--------------------+-----------------------+------------------------+
;Statistic                                                   ; Top                     ; dump_qxp:u_qxp     ; pzdyqx:nabboc         ; sld_hub:auto_hub       ;
+-------------------------------------------------------------+-------------------------+--------------------+-----------------------+------------------------+
; Logic utilization (ALMs needed / total ALMs on device)      ; 52714 / 427200 ( 12 % ) ; 0 / 427200 ( 0 % ) ; 64 / 427200 ( < 1 % ) ; 81 / 427200 ( < 1 % )  ;
; ALMs needed                                         ; 52714                   ; 0                  ; 64                    ; 81                     ;

Thanks,

OT