Can you manually verify the submitted sites. Not manually through GSA SER but with your browser and make sure your url is getting inserted into the article.
@Satans_Apprentice Sounds like captchas arent being solved. Have you tried doing them manually or using a captcha service? A lot of the web2.0s use recaptcha which Captcha Breaker has a low solve rate.
As to why it rolled back to 0/0 after it had 12, this doesn't sound normal at all, it is like SER cleared it some how.
Comments
https://forum.gsa-online.de/discussion/3192/serengines-com-web-2-0-engines-official-thread#latest