Hmmm, that is strange. I was thinking that if you were poppin'em open after a week, that would've been the reason. But what you have described seems to have been okay. When I added the corn sugar solution I boiled it in water for 5min then let it cool. Added it my bottling bucket. I racked from the primary right over top of the corn sugar solution. I didnt stir it at all, and my Hefe came out perfect. How much corn sugar did you use?