Brewing a red ale and it’s been fermenting just below 70 degrees for a little over 2 weeks and the FG is higher than what the recipe says it should be. OG was 1.050 and currently is at 1.016. Recipe says it should be at 1.011. Thoughts? Do I need to repitch the yeast? Let it sit? There was a tiny spot of what looked like mold in the airlock too. Is that a bad sign? Thanks!