Biscuit Delivery Timer Reset Bug [GAMEPLAY]

I was playing normally on summoners rift when I had noticed I had 2 biscuits from the biscuit delivery rune I popped one and just before the first ones timer ended I used the other one except the first ones timer actually reset thus giving me the healing and mana recovery of 3 biscuits.I went ahead and tested it in three more games to make sure and each time it would do that as for how the bug happens it happens when you use another biscuit just before the first one is about to end I did not test if it does that if you use the biscuits one after the other.I have also got the replay video of it happening but I don't know how to insert it here. P.S Its not champion specific i made sure to play other champions.