I dropped E.B. into my Enigmatica 2 Expert install, and noticed that when I use it to place blocks from a dank/null (I have the gold/yellow version if that matters), it only uses up one block regardless of how many are placed down by EB. I tried it in floor or wall placing mode. Seems like a pretty serious duping issue (since you can get many blocks out of using just one block).
I have not tried with just dank/null and EB installed on an instance, so it's possible one of the other mods in Enigmatica are interfering.