AUM not re-using expired UNDO extents

Hi there,
The space consumption in the UNDO tablespace is continuesly growing.
I've increased the size of the UNDO tablespace several times now (currently 400M) but this offers no permanent solution (datafiles are set in no autoextent mode).
It's possible to calculate the maximum size that you need for your UNDO tablespace using certain values from v$undostat and v$parameter.
According to this calculation our UNDO tablespace shouldn't be larger than 100M.
It looks like there is a problem with re-using expired UNDO extents, as indicated below (SUM(EXPBLKREUCNT) = 0 ):
SQL> select sum(EXPSTEALCNT), sum(EXPBLKRELCNT), sum(EXPBLKREUCNT) from v$undostat;
SUM(EXPSTEALCNT): 7
SUM(EXPBLKRELCNT): 1792
SUM(EXPBLKREUCNT): 0
Does anyone experience the same problem ?
Regards,
Miklas

what is your undo retention set to

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