Hi Yosi,
To better understand your issue, could you please share some more details?
1. How are you recording conversions in AdWords? Are you using AdWords API to upload conversions?
2. Do you mean to say that the UserList set up in your AdWords account's Audience is not growing in spite of conversions being set as the rule to add users?
Additionally, please confirm if you are using AdWords API and facing these issues.
Thanks,
Sreelakshmi, AdWords API Team