My hashrate on the pool is : Hash Rate:5.59/5.74THs , have been like that for months.

But the last day the rewards page says :

Mining Rewards
The rewards you've earned for each block the pool has found.
See the Payments page for the payments you've been sent.

Block            Block UTC            Miner Reward   N Diff   N Range   Pool N Avg   Your %   Your N Diff   Your N Avg   Your BTC
400324   27/Feb 22:39   24.97394274   831.454G   36hr 10m 43s   27.42PHs   0.02%   141.008M   4.65THs   0.00423538
400296   27/Feb 19:08   25.23087171   829.858G   37hr 15m 53s   26.57PHs   0.02%   146.096M   4.68THs   0.00444188
400295   27/Feb 18:48   24.96490448   821.512G   36hr 56m 6s   26.54PHs   0.02%   144.531M   4.67THs   0.00439213
400259   27/Feb 13:27   25.32686733   822.032G   37hr 40m 10s   26.03PHs   0.02%   152.696M   4.84THs   0.00470456
400046   25/Feb 23:47   25.23437042   826.691G   34hr 57m 21s   28.22PHs   0.02%   167.109M   5.70THs   0.00510091
400035   25/Feb 22:17   24.88693892   825.793G   35hr 13m 8s   27.97PHs   0.02%   168.403M   5.70THs   0.00507515
399973   25/Feb 12:13   24.85128469   817.792G   36hr 13m 56s   26.93PHs   0.02%   174.761M   5.75THs   0.00531068
399918   25/Feb 04:25   25.14294614   825.212G   39hr 15m 17s   25.08PHs   0.02%   188.683M   5.73THs   0.00574886
399867   24/Feb 18:35   25.23428297   825.697G   41hr 20m 50s   23.82PHs   0.02%   198.446M   5.73THs   0.00606474

About 1 THs is gone ? My BTC reward would ofcourse go down when the difficulty goes up, but my N AVG ?

Something wrong with the pool ?