I’ve got an alchemical chest almost filled with iron with a hopper below going into a rotary macerator. The macerator is piped out into other alchemical chests. Originally I wanted to do just do almost a full chest of refined iron ingots but the whole alchemical chest of refined iron ingots filled up and my iron supply was untouched. Long story short, I have filled up 9 alchemical chests full of refined iron ingots and my iron supply hasn’t gone down by 1 iron.

(from xJon/Tekkit-2#174, using the latest version of IC2C)

@xJon the bug was on ProjectsEs side.
They didn't sanitize their outputs from inventories when you extracted them.
Which caused this issue.
I simply now forcefully sanitize the data and now it works just fine...

Can't reproduce it in tekkit 2 sooo not a bug.

Seems to be reproducible in this video: https://youtu.be/8FVhy3Inq_w?t=1272
I also managed to reproduce it myself using a Rotary Macerator with Import and Export upgrades, adjacent to alchemical chests on each side, with the imported-from chest containing multiple stacks of Iron Ore.

An extra report from Discord:

Found an interesting feature / bug. A rotary macerator with two chests left and right and import/export upgrade will never consume the items from the import chest if you have at least two stacks in it.

I`m having the same problem.