Bitter Norwegian pale ale 6%

Using 1ml of hop extract at 60 minutes produced way more than the 10 IBUs I was told it would. This beer is quite bitter. I mitigated it a bit by adding calcium chloride to the finished beer, but it's still fairly bitter. I am a bit concerned for the 10 gallons of lager that got 4 ml of the exact (it's still fermenting).

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