Is my Script impacting other players?

Hello again I'm doing a block as if it were a training area doubles my stats after entering, although I'm using Region3, when I enter my stats multiply, but those of other players multiply as well. How do I fix this?

The Script:

local Players = game:GetService("Players")
local Region = Region3.new(script.Parent.Position - (script.Parent.Size / 2), script.Parent.Position + (script.Parent.Size / 2))

local function scanForPlayerInRegion(Player)

    local Parts = workspace:FindPartsInRegion3WithWhiteList(Region, Player.Character:GetDescendants())

    if(#Parts >= 1)then 

        return true
    else
        return false
    end

end

spawn(function()


    while(wait(1/60))do

        for _,Plr in next,Players:GetPlayers()do
            if(not(Plr.Character))or(not(Plr))then continue end --------- The line checks when player is on the part
            if(scanForPlayerInRegion(Plr))then

                print("Player was on the part!")----------------


                game.ReplicatedStorage.Training = 1000000 ---- The Training is IntValue

            else

                print("Player was out the part!")-------------- The line detects the player out the part.

                game.ReplicatedStorage.Training = 1000

            end
        end
    end
    end)