iron ore, and gold ore not working

[Izanaagii]

On my skript for creating an automatic mine in my spawn, I use

on break of coal ore:
    message "oui"
    if "%region at player%" contains "spawn":
        message "oui2"
        drop coal at event-block
        set event-block to bedrock
        wait 10 seconds
        set event-block to stone
        wait 300 seconds
        set event-block to coal ore

on break of iron ore:
    message "oui"
    if "%region at player%" contains "spawn":
        message "2"
        drop iron ingot at event-block
        set event-block to bedrock
        wait 10 seconds
        set event-block to stone
        wait 300 seconds
        set event-block to iron ore

But once I use iron ore, and I break it's not working Please fix this, thanks!

[TheLimeGlass]

Works for me, what version of Skript and Spigot version?