Probably related to either the type of solvent or the amounts of solvent you're using. It needs to be aliphatic naphtha, without any aromatics mixed in (such as xylene etc).
The other thing is using 30ml warm solvent per gram of impure DMT (and doing another 10-20ml pull to get more actives but freeze separately because this will be more impure). If you're using more solvent, its not gonna separate the goo.
Hope it helps! All of this is written in the FAQ
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