conversions yes > leads no

I installed the leads plugin and created a simple form with email field only. After filling the form on my website I can find the email adress in the conversion tab of the form settings, but I can find nothing on the lead list. Reinstallation of the plugin and deactivate other plugins doesn’t help

https://wordpress.org/plugins/leads/