Metadata

[Sythical]

Hello.
I am currently trying to make a generator skript where when you shift right click a generator, the type of generator is set to a metadata tag, and then when you click to upgrade it, if the block from the metadata tag is a hay bale, if the player has a balance greater than 5000, it sets the generator to a pumpkin one for example.
This is what I currently have, and when I click on the 13th slot in the gui, it says "<none>" when it should say "Hay Bale"

on right click on hay block:
    if player is sneaking:
        if {wheatgen::%location of event-block%} is player's uuid:
            upgradeGUI(player)
            set metadata tag "upgradeBlock" of event-block to {_block}

on inventory click:
    if event-inventory = (metadata tag "upgradeGUI" of player):
        cancel event
        if index of event-slot is 13:
            broadcast "%{_block}%"

EDIT:
I have figured out how to make it check if the block is a hay block or not, but now, when I place down a hay block and I click on the slot, it says "It's a hay block", but then when I place down another generator, it also says "It's a hay block". So then, when I break both of the gens, and place a gen that is not a hay block first, it says "It's not a hay block" and then when I place a hay block, it says "It's not a hay block". Any ideas how to fix this?

on right click on hay block:
    if player is sneaking:
        if {wheatgen::%location of event-block%} is player's uuid:
            upgradeGUI(player)
            set metadata tag "upgradeBlock" of {hi} to {_block}
        else:
            cancel event
            send "lol no" to player
    else:
        send "&cYou need to be sneaking to upgrade this generator."

on right click on pumpkin:
    if player is sneaking:
        if {pumpkingen::%location of event-block%} is player's uuid:
            upgradeGUI(player)
            set metadata tag "upgradeBlock" of player to {_block}
        else:
            cancel event
            send "lol no" to player
    else:
        send "&cYou need to be sneaking to upgrade this generator."

on inventory click:
    if event-inventory = (metadata tag "upgradeGUI" of player):
        cancel event
        if index of event-slot is 13:
            set {_block} to metadata tag "upgradeBlock" of player
            if {_block} is a hay block:
                send "&a&lIT'S A HAY BLOCK!!"
            else:
                send "&c&lIT IS NOT A HAY BLOCK!"

EDIT 2:
Now it doesn't send anything lol..
[doublepost=1604335036,1604239989][/doublepost]Can anyone help?? lol