Crafting Bug: ingriedients placed, product disappears

[pewpew378]

Hi,

So I installed the Voltz Pack on my server, everything is working so far.

But today i wanted to create steeldust via the iron ingots+4coal recipe.

when i place the last of the 5 ingriedients into the crafting table, the steel dust appears for a moment and then disappears instantly. i have the same bug when i try to use an iron ingot to make iron nuggets...

is this an error on the client side, an error on the server or just a bug in the voltz pack?

anyone knows a fix to this problem?