I have 2 melting houses: one for silver pfennigs and one for gold guilders. The one for guilders works just fine, but the one for pfennigs just won't receive the materials it needs to craft the pfennigs.
This sounds like a bug to me...
Can you list the mods you're using, in order, with the version numbers? Everything looks fine in 1.75.
Inedible Barley
Ridiculous Storage
<abbr title="Colonial Charter">CC</abbr> No Smoke
Super Easy Trading
Inedible Milk
Inedible Wheat
1.0.7 Compatibility
Inedible Sorghum
Inedible Coffeebeans
Inedible Sugarbeets
Inedible Canola
Inedible Oats
Inedible Vegetable Oil
Inedible Olives
Inedible Rye
Inedible Sunflowers
<abbr title="Colonial Charter">CC</abbr> 1.75
<abbr title="MegaMod">MM</abbr> 0.07
<abbr title="MegaMod">MM</abbr> Decopack 0.07
Radius Recolour
Call of Nature Soundtrack (but in this playthrough inactive)
Those are the mods I use, in that order.