ok, so, i've been messing with my server for a week or so to fix my problem.
alli got is that one of my plugins is preventing non-opped players to join.
Theres a list of all the plugins my server has when it started happening in the attached image.
I do not know which plugin is breaking all of it, so im going to ask here , since theres barely any staff online on the actual server hub.
Thanks in advance.
-Mercyless