It was Munton's ale yeast that came with the kit and it was fermented at 68 degrees.
Munton's yeast is a poor quality yeast, and it's a small package (7 grams) as well, so it's probably a combination of underpitching the yeast (not using quite enough yeast at the beginning) and the funky off-flavors that Munton's produces.
I'd not use Munton's or Cooper's yeast, and instead buy a quality ale yeast in the future.
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