I have been brewing cider for a few years now and just did a tried and true recipe(Basically half white grape cherry juice and half apple juice, I can link to recipe if needed). The taste up front is correct, but it hits with a grassy aftertaste which I has never happened before in any cider I have brewed. I fermented with S-04, it was only half a packet so I made a starter and pitched. The only thing I noticed that appeared off during fermentation was that I had yeast stuck to the sides of the fermenter instead of dropping to the bottom. What may have caused this off flavor? Thanks in advance!