We use OW2 JIRA to list bugs and features. You can first check on LemonLDAP::NG JIRA project that your bug is not already referenced, and then create it (with a registered account).
The team
Core team
Clément “KPTN” OUDOT: project leader, lead developer, graphics, documentation, community management
Xavier GUIMARD: historic project leader, developer, Debian packager, administrator of big Lemonldap::NG instances