Thank you for contacting us, this is a known issue that can occur at random times when playing Unturned.
#1: Try joining the server 2-3 more times and see if that can fix the issue, if not try joining another server or multiple servers and then come back to PandaHut servers and try to rejoin.
2#: Try restarting Unturned, sometimes the game might just need to restart to load all the files again.
#3: Try logging out of Steam and shutting Steam down from your TaskManager (Open TaskManager, find Steam Client Bootstrapper (32/64 bit), right click this and then click "End Task"). After doing this try starting up Steam, sign in and then start up Unturned, then try to connect to the server.
#4: Try quitting Unturned completely and validating your files. Here's a guide link:
http://www.pandahut.net/validate. Follow all instructions and see if the issue is resolved.
We hope any of these suggestions fix your issue, Thanks for letting us know about this.
All feedback is useful to us.

Ex-Head Roleplay Administrator
Ex-Global Moderator