are the sprites on top of each other? it sounds like u are pressing overlapped objects at the same time. the event code should work fine as long as the objects don't overlap. and are different types/names.
and my all events at the same time u mean the two in the picture im guessing?
or other events as well? it might be a "touch/mouse" function or just ur cache needing some clearing. try a different browser if above is not the issue or clear cache. sometimes might get buggy if u working for multiple hrs and closing/opening the project a lot of times a day.
but since ur doing a touch and find missing object, my thinking is u got overlapped objects and the event code u have is missing "identification order" which item should it pick to trigger the even the top or bottom one?