Justibone

Recipes 

Sounds kinda like uneven sugar.

The solution is: during the first week or so of primary, shake or stir the beer every now and then. Stop shaking a few days before bottling time. When bottling make sure the beer is mixed after you add the bottling sugar (though don't aerate/oxygenate it; use a sanitized spoon or something).

It shouldn't happen again, if you go that way. I think it was more the fact that you bottled the Grolsch bottles last and the sugar wasn't evenly distributed, rather than the fact that they are Grolsch bottles.

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Best Brews Yet:

Edwort's (modified) Apfelwein
BierMuncher's Centennial Blonde
Cuinrearview's Gumballhead-Inspired WPA
Pelikan's John's Red English Barleywine

Mmenges

Recipes 

Could also be that the bottle hasn't had enough time to carbonate. You should allow three weeks or so before consuming as the beer won't carbonate properly. The sugar that is used for priming is consumed by the yeast and sits in the headspace of the bottle. It needs a little time to dissolve back down into the beer. If you open a bottle too soon you may notice that it foams up after the cap is popped off. Here is a video that better explains what you're problem may be.