Latest Spigot version 1.13.2
Problem plugin is SimplePortals.
Issue: Add simpleportals.* perm, and all users can use all portals.
Use just the simpleportals.portal.jungle perm and user can't use that portal.
Any help much appreciated.

Muddup

Use the verbose command from LP, to find out what permissions are required.
Also please don't use issues here to ask for support with plugins other than LP.