Conversion tracking with Analytics
I have had a lot of issues getting tracking to work with Adwords. In Adwords for March 1-15th I have 18 conversions showing up, In Analytics I have 33 conversions showing up for Google cpc.
Re: Conversion tracking with Analytics
One of the reason can be AdWords cookies expire 30 days after a customer's click, while Analytics uses a cookie that lasts six months to two years. That means if a customer completed a conversion 31 days after clicking on an AdWords ad, the conversion wouldn't be recorded in AdWords but would be in Analytics.
Kindly read the Conversion Tracking and Google Analytics article for more details.