Why are these conditional statements not working?

The function "IsANPC" keeps failing to work and returns false not just that it prints twice,why?

Output:

false

false

false

false

Part has a Humanoid

Part has the value NPC

Part has a String Value

false

Part has a Humanoid

Part has the value NPC

Part has a String Value

Part has a Humanoid

Part has the value NPC

Part has a String Value

Script:

--[[Purpose:I'm making a script that is finding npcs with the value "Shop"
and making them into a shop]]--

--Part = Instance.new("Part",game.Workspace)
--Humanoid = Instance.new("Humanoid",Part)
--Value = Instance.new("StringValue",Part)
--Value.Name = "NPC"
--Value.Value = "Shop"

ShopNPCs= {}

Functions = {
    IsAShopNpc = function(Part)--Used to justify if it's a Shop Npc
        if Part:FindFirstChild("Humanoid") then
            print(Part,"has a Humanoid")
            local Value = Part:FindFirstChild("NPC")
            print(Part,"has the value NPC")
            if Value then
                if Value:IsA("StringValue") then
                    print(Part,"has a String Value")
                    if Value.Value== "Shop" then
                        print(Part,"contains the Value Shop")
                        return true
                        else return false
                    end
                end
            end
            end
    end,}

for _,Object in pairs (game.Workspace:GetChildren()) do
    if Functions.IsAShopNpc(Object) then
        table.insert(ShopNPCs,Object)
    elseif not Functions.IsAShopNpc(Object) then
        assert(false,"is not a NPC")
    end
end

If the part has all these qualities why isn't it returning true and why is it printing it twice?

How could I fix this?