Database Software

Dear DBAs.

I just wondered why a "select * from USER_DATAPUMP_JOBS" shows me 4 jobs in my database owned by sys, while I have no job running.
Simultaneously "select * from DBA_DATAPUMP_SESSIONS" is NULL.

Are these in fact previous jobs that can be killed?

Does 11gR2 come with internal data_pump_jobs?
I have the feeling that something is wrong in my db regarding this issue.

Any help is appreciated.

Best regards,

Sebastian

PS: I am running 11.2.0.3.0