Lemme ask you this - was your goat milk ever frozen? Or kept in the fridge solely? A lot people don't realize, but when you freeze GM, since it is only kinda sorta mostly naturally homogenized, it does, can and will separate! Also...I have noticed...once you freeze it you NEVER get it back to it's normal "milky state" -
it always has thick chunks and lumps and bumps of butterfat in it! You can shake up refrigerate milk if it separates but you just can't change that frozen milk back to what it was when it was fresh...
I admittedly don't know a ton about soap making yet, but I DO know my milk LOL
I always strain my GM before I soap with it OR when I did the "add lye to frozen milk" experiment I strained it as I poured it into the oils...because I HATE HATE HATE drinking GM that has been frozen due to the lumps....I won't leave those lumps in anything (except bottles for baby goats) but stuff for me, I make sure to get the lumps and bumps out
Anyways -I am betting if your milk was frozen then the soft lumps were the butterfat in the milk that had already reacted to the lye or just were still soft fatty lumps - I have tried everything in past years to make frozen milk have a palatable texture for drinking and STILL find those fat lumps in it...just saying...tossing out the little that I know and hoping it applies for you