I found a bug inside my redstone circuit
I also tried it in vanilla client and there it worked liked expected
I tried to build an item filter with hoppers and chests
I got the building instructions from http://minecraft-bauideen.de/Item-Sortiermaschine ... sorry but it's only in german and i found no english description and i'm to lazy to translate the complete text.
But i build a world with a simple version of the construct
https://dl.dropboxusercontent.com/u/12041221/New%20World--.zip
Expected result was everything i stuck into the input chest should be moved to another chest, except iron ingots those should be filtered out
As i said vanilla works as expected.
But Forge transforms EVERYTHING i stuck in the input chest into iron ingots...
Running SP and MP 1.8.9-11.15.1.1722 ... i'm aware that this version is a few days old, but i think this bug is exotic enough to not be fixed by now
But it is to late not to install a new version
i will have a look at a current version tomorrow