Data with same time stamp out of order

i have some log file contains time based logging, and there are lines having the same time stamp, e.g

07/28/2015 11:46:03.100: xxxxxx
07/28/2015 11:46:03.100: yyyyy
07/28/2015 11:46:03.100: zzzz

problem is when i search from Kibana, data came out is not in its original sequence, maybe something like below.
07/28/2015 11:46:03.100: yyyyy
07/28/2015 11:46:03.100: xxxxxx
07/28/2015 11:46:03.100: zzzz

Is there anyway to solve this problem?
(I'm not sure which category this problem belongs to, sorry if i put it wrongly)