Gravel quest bug

[FavouredGenie27]

When I got the buy 20 gravel quest I said ok and bought 16x of gravel instead of one each to speed it up and when I did it the quest it did not register it it only gives you the quest if you buy it one at a time buy I bought 16x at once and did not give it to me so I then bought one and it gave the quest to me please fix this.