Thanks Bernhard for your response.
a) This situation is only for a single user. For all other users it looks fine. I can see many jobs are scheduled through user. It is showing lock/unlock details before Feb but not after it. Even I locked it yesterday but it somehow didn't updated.
b) Checked Tcode-OY18 with table USR02/USH02. It shows nothing was deleted or edited.
c) The user was never deleted in between.
d) Check SE38--RSUSR_LOAD_FROM_ARCHIVE. It shows empty result.
Any other inputs/idea.
P.S This is happening for only single users. For others its working fine.
Regards
Pankaj