Im trying to make a backpack script but Wheat does not seem to increase in value on the textlabel?

This is because you have only set the textlabel once in the script meaning it would only run once. If you want it to change: use the Changed event like this:

    local BackPack = script.Parent.BackPack
    
    local Player = game.Players.LocalPlayer
    
    local Wheat = Player.leaderstats.Wheat
    
    local Storage = script.Parent.Storage.Value
    
    local Storage = "25"
    
      
    
    BackPack.Text = Player.leaderstats.Wheat.Value.."/"..Storage
    Wheat.Changed:Connect(function() -- when wheat changes it will fire this function
		BackPack.Text = Player.leaderstats.Wheat.Value.."/"..Storage
    end)
    
    if Wheat.Value == Storage then return end