Bad password, ID_DST_SHARD_SILENT_DISCONNECT

A server I was hosting after about 70 days in the world, is now getting a bad password error when entering the caves, when prior it had worked. 

The logs consistently give us the error
[00:01:56]: [Shard] Forwarding player to Caves(3756221854)
[00:01:56]: [Shard] Begin migration #2 for (KU_tMQjiydW)
[00:01:56]: [Shard] #2 [SHDMASTER](1) -> Caves(3756221854)
[00:01:56]: CloseConnectionWithReason: ID_DST_SHARD_SILENT_DISCONNECT

we have tried allowing the servers ports through our firewalls, looking at all the .ini files for any mismatching ports or passwords, restarting without mods on a fresh new world just to test it, no client or server mods, still resulting in the same issue. We also tried using a dedicated server to host it (both with the standard tutorial linked in the forums using the bat file as well as using a Vox launcher), and after setting it up and running it, we found that neither of us were able to go to the caves in this world, meaning the problem had extended to both of us, and I may have been able to avoid it as I had been the one hosting it previously. 
I've attached the save game files in the zip and the client and master server log if that could be of any use

game saves.zip