Sometimes you can find some older data in WarpLeads database. Our database is quite big around 100M and it is not so easy task to keep it up-to data all the time.
We do our best to refresh data on regular basis (every few months) but in some cases data cannot be refreshed so we do not update older data.
We are currently working on improving data quality and refresh interval.
You can track progress of that on our Public Roadmap .