The game is about an apocalypse,and,the zombies are located in ServerStorage , inside a folder. When the game starts ,you can move ,but,teleporters,tools,etc are frozen ,Is anything wrong with the script? (There are around 20 zombies inside the folder)
wait (28)
Model = game.ServerStorage.Zombies
Model.Parent = game.Workspace
Model:MakeJoints()

6 comments
ew bad grammar
Are they anchored?
probably not the issue but you might need to use "local Model"
you know you might wanna do Model:GetChildren or just use for i,v in pairs
Bad grammar is like poorly indented and spaced code. Both are unreadable.
it probably has to do something with roblox itself. Recently, in studio, I noticed that unanchored parts don't have any physics and it appears as if they are anchored.