Not a bug exactly...
I was feeding my piggies to make piggy plops (as you do). When I click on a veggie item of which I have lots (over about 30?) the lowest number of items you can feed your piggy is 10. Given that it only takes 3 item to produce a piggy plop, I don't really want to be feeding it 10 every time - it really makes a dent in thr inventory when you're making piggy plops for a project.
It would be helpful to have an option for a smaller amount - say 3 or 5.
I couldn't find a way round this unless you keep slipping veggies into separate smaller amounts in your inventory - which could be an issue if you don't have much space.