probably moisture content or possibly packed the jar to much, with brf you want it slightly packed but still pretty light an fluffy. Your moisture could have been off, but reguardless of what type of verm, you must make sure its feild capacity. you could remove the uncolonized part and dunk and roll to finish it off, with a hindered yeild of course.i think it has to do with my moisture levels being off due to me using horticultural verm instead of regular. that stuff was so fine...and no my incubator was covered..2x over...and spraypainted..the only uncolonized part was on the bottom of the jar about the size of my pinky fingernail..even smaller.