Hello Dannison,
Thanks for your reply.
Actually, I found the reason of this problem, in this link:
It occurred because I ask the clicks and impressions from the KEYWORDS_PERFORMANCE_REPORT, so the results segmented by keyword.
I tried to get this metrics from ACCOUNT_PERFORMANCE_REPORT and the result came right!
But if I want to continue get the results from the KEYWORDS_PERFORMANCE_REPORT, what can I do? Do you have an idea?
Thank you for helping!