This is similar to ZBX-5310
Same behavior:

select * from history_uint where itemid=25931 ORDER BY clock DESC

itemid,clock,value,ns
25931,1410831049,3236240,301393560
25931,1410830750,3588288,18039175
25931,1410830449,4052744,507835281
25931,1410830149,3835320,312176722
25931,1410829549,25423737631776,460369351
25931,1410829249,3274560,794110461
25931,1410828949,2798496,352433422
25931,1410828649,3591272,776731582