The players get a value but then for some reason they wont get the clone?

the player's backpack is reset whenever they spawn

usually, when PlayerAdded fires, the player's character won't have loaded yet, meaning the tool is deleted when they actually do spawn

you can put the tool in the player's StarterGear to ensure they get the tool every time they spawn, or if you just want them to have it the first time they spawn, you can wait for CharacterAdded to fire

-- StarterGear
local mirclone = game:GetService("ReplicatedStorage").Mir:WaitForChild(player:WaitForChild("Mir").Value):Clone()    
if mirclone:FindFirstChild("Kwami") then
    local mirmodel = mirclone:FindFirstChild("Kwami")       
end
mirclone.Parent = player:WaitForChild("StarterGear")

-- CharacterAdded
player.CharacterAdded:Wait()
local mirclone = game:GetService("ReplicatedStorage").Mir:WaitForChild(player:WaitForChild("Mir").Value):Clone()    
if mirclone:FindFirstChild("Kwami") then
    local mirmodel = mirclone:FindFirstChild("Kwami")       
end
mirclone.Parent = player:WaitForChild("Backpack")