Hello Deepak,
nice to see your name 
Report RSPO1043 is only responsible for the spool-related TemSe objects. (Also, it uses the KONS TemSe object to keep track of the spool objects-to-be-deleted.)
This means that RSPO1043 should not be responsible for deleting all TST03 contents. This issue sounds like several other TemSe-housekeeping reports are running, and their result can be seen as deleted TST03 entries.
So I would say that other (automatically) scheduled batch jobs are processing in the background.
If your database contains a program / script which records which TST03 entry has been deleted by which program, then it could show further information what are exactly deleting the TST03 records.
Best regards,
Laszlo