Fix bugs

code/modules/mining/machine_processing.dm

@@ -215,6 +215,7 @@ span.smelting {
 			for (i = 0; i < 10; i++)
 				var/located=0
 				var/insufficient_ore=0
+
 				// For every recipe
 				for(var/datum/smelting_recipe/recipe in recipes)
 					// Check if it's selected and we have the ingredients
@@ -228,6 +229,7 @@ span.smelting {
 
 					// Otherwise, if we've matched
 					else if(signal==1)
+
 						// Take ingredients
 						for(var/ore_id in recipe.ingredients)
 							ore[ore_id]--
@@ -248,7 +250,7 @@ span.smelting {
 
 					// Take one of every ore selected
 					for(var/ore_id in selected)
-						if(ore[ore_id]>0)
+						if(ore[ore_id]>0 && selected[ore_id])
 							ore[ore_id]--
 					// Spawn slag
 					new /obj/item/weapon/ore/slag(output.loc)

code/modules/mining/smelting.dm

@@ -6,8 +6,10 @@
 // Note: Returns -1 if not enough ore!
 /datum/smelting_recipe/proc/checkIngredients(var/obj/machinery/mineral/processing_unit/P)
 	var/sufficient_ore=1
+	var/matching_ingredient_count=0
 	for(var/ore_id in P.selected)
 		var/required=(ore_id in ingredients)
+
 		// Selected but not in ingredients
 		if(P.selected[ore_id] && !required)
 			return 0
@@ -19,13 +21,17 @@
 		var/min_ore_required=ingredients[ore_id]
 
 		// Selected, in ingredients, but not enough in stock.
-		if(P.selected[ore_id] && required && P.ore[ore_id] < min_ore_required)
-			sufficient_ore=0
+		if(P.selected[ore_id] && required)
+			if(P.ore[ore_id] < min_ore_required)
+				sufficient_ore=0
+				continue
+
+			matching_ingredient_count++
 
 	if(!sufficient_ore)
 		return -1 // -1 means not enough ore. NOT A TYPO.
 
-	return 1
+	return matching_ingredient_count == ingredients.len
 
 // RECIPES BEEP BOOP
 /datum/smelting_recipe/glass