So, there is an issue whit hoppers when sometimes, the hopper seem to give a new slot an item that was already in the next chess, hopper or other blocks whit storage. said Item is stackable and wasn't at 64 items yet.
On the screenshot, I have a 32 items group before a 22 items group in the chest.
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Cleaning up old tickets: This ticket had been set to 'Awaiting Response', but has not received a response from the reporter (~3 months+) so is being closed as Incomplete. If you feel this is still a valid issue then please comment, or create a new ticket following the Issue Guidelines which includes steps to reproduce the problem.
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It is not clear from the picture or description exactly what is happening. Please try to clarify further which exact which item(s) are going into which slot.
You also state that in the picture you "have a 32 items group before a 22 items group". The picture shows a stack of 21 bones in the row above the stack of 32 bones. So any new bones pushed into the chest will first go in the stack of 21.
In general, when items are pushed into a chest (or other container), the first available slot will always be used, which might be empty, even if there is a partial stack in a later/lower slot. This is the expected and known behavior. Please let us know if that is what is happening for you.