Just short:
Spoiled Meat does not stack in invetory when “created”
Coal does not stack when “burned” wood/thatch in fireplace/forge etc
hope you understand what i mean.
thats the only problem i have all other stacks fine 
- its just the “random creation” thats not stack, if i craft something it stacks normaly
Spoiled meat - check your raw/cooked meat files and ensure that “Spoil Gives Item” (or whatever) is your modded spoiled meat.
Charcoal - the structure that makes the charcoal (like a campfire) in CampfireBP is set to create Charcoal, not Charcoal_Child. Stack mods have remapped crafting and cooking stations for this reason.
ok the Spoiled Meat is working fine now, thanks for that. But the coal is still not staking 
Look for “Override exact class crafting requirements” (or something similar, I don’t have the kit open. It’s a checkbox in the primal BP) in the charcoal (and anything else with stacking issues) and check it.