Skript anvil recipe help

[Seba]

Hello, anyone know how to fix the code?

when I drop a diamond pickaxe of efficiency 5 + diamond pickaxe of efficiency 3 the result will show efficiency 6 which should not.
the result should be diamond pickaxe of efficiency 5 + enchanted book of efficiency 5 = diamond pickaxe of efficiency 6 with lore
Code:

on anvil prepare:     
    if slot 0 of event-inventory is a diamond pickaxe:
         if slot 1 of event-inventory is an enchanted book:
             if stored enchants of slot 1 of event-inventory contains Efficiency 5:
                 set {_i} to slot 0 of event-inventory
                 set line 1 of the lore of {_i} to "&aWydajność VI/X"
                 enchant {_i} with Efficiency 6
                 set event-slot to {_i}
                 set repair cost of event-inventory to 30

Skript 2.5.3, Skbee 1.10.2, Minecraft 1.16.5
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