Yes, way more than 10%, actually, on some websites I can see like only 40% of conversions.
I would not mind having 10% difference between the two as I generate more than 1k conversions per day so I would know what converts, but having less than a half of the conversions I can see in Adwords is bad.
The problem might be related to my websites setup, I use http, https and subdomains here and there, like I trigger click pixel on the LP then 'signup' conversion pixel on another subdomain, however... I'm not 100% sure how Marin's platform work, and the setup was accepted and their staff's helped implemented it.
We also use Site Tagger to manage pixels, tracking codes and 'wahetever' we need to place here and there and I've thought that was a problem but it wasn't the case.
The weird thing is I can see most of the conversions in Marin's conversion log, but there's some missing data, so conversions are not visible in the reports.
I'll molest their support, they have to sort it out for me somehow...