This isn't a bug, but more like something that can be polished a bit.
Sometimes it's very easy to accidentally press enter twice, or press it before you punch in a number. Make it so when selecting a pig or batterfly to feed, auto-select feed one. Also when selecting various items, make it so it does not auto-select ANY items upon opening the item selection menu. This will prevent accidental feedings in the long run and stop anyone from feeding 250 allspice to a pig.
PLEASE PLEASE FIX THIS!