if a stack of an item is put into a hopper facing downwards into another hopper via the hopper GUI or dropping the stack of items onto the hopper; then both hoppers will move an item down at the same time. this will cause a build up in the next hopper facing sideways unless the sideways hopper is facing into another container and has another hopper below it. should the sideways hopper be facing into a container and have a hopper below then the items will be distributed evenly between the container and the hopper below.
Notes
only happens if given a stack of an item type (given 2 different items at the same time will not cause this)
will not occur if the items come out of a container (e.g chest or dropper on top or dropper putting items in hopper)
will not occur if items are given 1 at a time
does not happen with non stack able items
Linked issues
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Comments 2
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We're tracking this issue in MC-8361, so this ticket is being resolved and linked as a duplicate.
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I believe that's working as intended - the downwards facing hopper can both actively push items into the hopper below it as well as having items pulled out from it, thus resulting in two items being transferred at a time. The reason this doesn't happen when items are being pulled from a container is that there simply is only one item available to be pushed or pulled at a time.