I know this is a old thread but I have this happen with my Kolsch I just brewed. Weird thing is that I fermented a 10 gallon batch in my conical together. Then kegged 5g and bottled 5g. The bottles have this sweet homebrewy taste to them when the keg tasted oh so delish. I let the bottles carb for about a month so I dont think it was to short? Cant figure out why? Im thinking about just buying a counter pressure bottle filler and just scraping the corn sugar all together.