Job Interval time

When I submit a job, there is a 1-hour interval between the request time and the start time, which is why ?

select * from ps_pmn_prcslist where （rundttm -rqstdttm) > interval '60' minute and rqstdttm > sysdate -7 order by rqstdttm desc;

ps_pmn_prcslist

rqstdttm

rundttm