Hi ... it is mostly suggested that you add your MHRB in some water(lets say 600ml) in a container(jar A), then mix your lye and a little bit of water(lets say 100ml) in another container(jar B)
first stir or shake gently the container containing lye+water to make it dissolve good because it may stick at the bottom sometimes, and becareful while doing this step because it will produce a lot of heat. and remember to wear ur goggles and mask during the whole extraction process.
then you should add this lye+water solution(jar A) into your MHRB+water containing jar(jar B).
I didnt understand the exact process you have done but this is the most accurate way for doing it, without risk of splashing lye+water out when adding MHRB on it.

Gud luck