I'm 100% sure that I added the priming solution. I boiled with a cup or so of water, cooled, added to the bucket and racked on top. I also stirred well before filling the bottles.
I did soak the bottles in star san before and there was definitely some foam. However, everything I have read says this is not an issue.
This was an Austin homebrew kit and the bag was clearly labeled priming sugar.
Visually, the caps look fine. I have held several under water with no visible leaks.
My only guess here is mislabeled priming sugar or dead/slow/tired yeast.