This also happens on servers.
When you power a downwards facing dropper, its item will go anywhere.
Steps to reproduce:
Place a downwards facing dropper in the middle of the air
(optional) place blocks on the side of it, not underneath nor above.
Power the dropper
The items will fly in a random direction, and never will they go straight down. They will fly through the blocks beside the dropper too.
The dropper in the picture is facing downwards, I powered it around 10 times. Most items ended up above it...
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I had to take a few screenshots, but i got one with the item appearing partially inside the dropper.
I am having the same issue, I wanted some droppers to put items downwards into fire but instead they are flying sideways everywhere. I hooked it up to a comparator clock to get a better look at it and the items are indeed showing up partially or fully inside the dropper causing them to move upwards/sideways.