Hello. Other users have experienced similar problems, this may be more common than it seems. On an older thread, apparently still unsolved (not the only one), people associated a strange misplacement of anchored parts with TeamCreate. Did you use this tool?
Also, as Tyanarus suggested, check that you don’t have any plugin or, especially, scripts that could be causing this.
You can use Ctrl+Shift+X to filter objects and disable these scripts, or run this command in the command bar to delete any self-executing script: local function h(c) for i = 1, #c do v = c[i] if v:IsA("BaseScript") then v:Destroy() end end end h(workspace:GetDescendants()) h(game.ServerScriptService:GetDescendants())
To do this kind of tests, [color=red]use a copy of your game[/color] so it isn’t accidentally overwritten and you lose work!
If none of this works, try selecting all workspace children (except camera and terrain) and copy it. Open a brand new place (delete the baseplate if you want), paste it anywhere but inside the workspace and then drag it in the explorer to parent it to the workspace (directly parenting it to the workspace could result in all your game stuff being misplaced). Press F5 and check if the problem persists…