Mv log contains far more records than would expect - anybody any idea why?

Hi there,
We have created some mv logs with fast refresh in mind
example
CREATE MATERIALIZED VIEW LOG ON "DIMENSION_TABLE"
PCTFREE 60 PCTUSED 30 INITRANS 1 MAXTRANS 255 LOGGING
STORAGE(INITIAL 65536 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "TABLESPACE_NAME"
WITH ROWID, SEQUENCE ( "DIMENSION_KEY" ) INCLUDING NEW VALUES
However getting far more mv log records than expect.
e.g. at start no records in mv log, run a mapping , later check via minus operator what records insertde/updated in the dimension, say 50 recods in total, I would expect 50 records in the mv log.
However getting far far more,e.g several records for a dimension_key.
Why is this?
Is our mv log definition wrong. dimesnion_key is the primary_key?
Any advice, much appreciated.
Thanks

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Mv log contains far more records than would expect - anybody any idea why?

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