Problem with Extraction

hello Guru's

i have enchanced two feilds to two data sources and checked the data at rsa3(extract checker).

0fi_gl_10 is the datasource build on FAGLFLEXT table. i see the difference in the data at the extract checker and data base table (FAGLFLEXT). I FIND MORE RECORDS ARE EXTRACTED FROM TABLE. HOW COME IT IS POSSIBLE

SAME IS WITH 0CO_OM_CCA_9 DATASOURCE AS WELL WITH CORRESPONDING TABLES COSS AND COSP.

CAN ANY ONE PLZ HELP ME WHAT IS HAPPENING BACKGROUND WHY EXTRACT STRUCTURE IS EXTRACTING MUCH MORE RECORDS THAN WHAT DATA THEY HAVE IN DATA BASE TABLES.

Thanks

RAD