Fixed stacks sometimes having the wrong amount if created on another stack

code/modules/hydroponics/biogenerator.dm

@@ -262,8 +262,7 @@
 		if(!check_cost(D.materials, amount))
 			return FALSE
 
-		var/obj/item/stack/product = new D.build_path(loc)
-		product.amount = amount
+		new D.build_path(drop_location(), amount)
 		for(var/R in D.make_reagents)
 			beaker.reagents.add_reagent(R, D.make_reagents[R]*amount)
 	else

code/modules/hydroponics/grown/grass_carpet.dm

@@ -36,19 +36,8 @@
 			continue
 		grassAmt += 1 + round(G.seed.potency * tile_coefficient)
 		qdel(G)
-	var/obj/item/stack/tile/GT = new stacktype(user.loc)
-	while(grassAmt > GT.max_amount)
-		GT.amount = GT.max_amount
-		grassAmt -= GT.max_amount
-		GT = new stacktype(user.loc)
-	GT.amount = grassAmt
-	for(var/obj/item/stack/tile/T in user.loc)
-		if((T.type == stacktype) && (T.amount < T.max_amount))
-			GT.merge(T)
-			if(GT.amount <= 0)
-				break
+	new stacktype(user.drop_location(), grassAmt)
 	qdel(src)
-	return
 
 // Carpet
 /obj/item/seeds/grass/carpet