I think it could be the sodium carbonate because at this stage(assuming that it's been settling for enough time) even if the ph is low and the harmine/harmaline is still in the salt form the solution will look watery yellow not milky yellow.

the grateful one, thank u for ur work  and at the end of step 6 did all the solids dissolve? If yes then using a shirt will help reducing 2 steps of the tek.