First thing I would try is removing all your Client add-ons. This includes:
Client_EnvFavorites
Client_MenuMusic
Client_OrbShift
Gamemode_Slayer
Support_Garage
Support_Rendermen
System_ItemStorage
System_PTG
Tool_Duplicator
System_ReturnToBlockland
Move all of those add-ons to a different folder (like your desktop)
Start Blockland. If the problem persists, post your console.log again.
If it is fixed at that point, add the add-ons one-by-one back to your add-on folder, restart the game and test if the bug reappears after adding each one. When the bug pops up again, you'll then know which add-on was the cause of the issue. You should also let us know what it was at that point for future reference.