Mismatch of value between Google Adwords and DB on running sedatacheck.sh

Mismatch of number of impressions between Google Adwords and staging.googleSummaryCheck table on running sedatacheck.sh
Steps to reproduce:

1) Run the sedatacheck.sh from /usr/local/tsa/bidmgr mentioning the date range for a particular SearchEngineUserID
e.g., ./sedatacheck.sh -d3 --date 2012-05-14 --end 2013-06-11 --force -U 39
2) Check sum of impression on Google Adwords for that range
3) Check the sum of impression for the same in staging.googleSummaryCheck

Actual Result: Mismatch in number of impression
Expected Result: Same

Note:
1. Number of Clicks and cost matches between Adwords and DB
2. Works fine for Yell and Optus

DB output:

mysql> SELECT * FROM staging.googleSummaryCheck g WHERE g.campaignid IN (SELECT searchEngineIdentifier FROM tsacommon.searchEngineAccounts sea WHERE sea.description LIKE "%2eed7cf7-8329-49ed-b894-34d672907a90%");
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2 rows in set (0.00 sec)