Loginsecurity claims i'm online on my server even though i'm not

so, when i logged on my server, it was first normal, but then, commands etc. stopped working and i was disconnected from the server! when i tried to log back on, the authentication plugin i used claimed i was already online. i looked at the players tab of my server, and it said the same, i tried kicking myself out but it did not kick me out. is there any way to solve this?

ok, apparently loading a backup works. i'd however suggest NOT loading a backup that was created the same day that the problem appeared.