At a FG of 1.012, it shouldn't taste sweet. I'm guessing it's the carb drops, not fully fermented out yet. Give it some time- it should get better in a couple of weeks!
If it tasted a bit sweet when you racked it, was the FG 1.012 then? That's unusual, unless the beer is underhopped. Do you recall what the % was on the hops? (I don't really think that's the problem, I'm just thinking about why it might taste sweet at 1.012)