When stacking hopper minecarts on top of each other with or without a block separating each layer of minecarts they appear to exhibit some variance of favoritism in the distribution of their items. To my understanding, using the item input and hopper configuration shown in each example should evenly distribute the items into each container, which they evidently do not as shown by the lamps I used for an easier visualization for where the items ended up.
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Three things are going on there, I think.
Logically two hopper-minecarts under a container can only pull an equal share of items from that container if there are multiple items in the container to begin with, or if items are being added to the container at twice the rate that each hopper-minecart is pulling.
The game likely processes entities actions in the order that those entities were added to their chunk's data. So I would guess that you placed the hopper minecarts left-to-right, and that entails that for any pair, the hopper-mc on the left will always pull before the hopper-minecart on the right. That's why you're seeing the leftward bias in where items end up.
There is a bug causing diagonal pulling by hopper minecarts in some directions: MCPE-57637. That may or may not be impacting what you've built here.
Based on (1) and (2), what you're seeing isn't a bug, its just a logical consequence of what you've built and how the game works. There are other ways to split items from one container to multiple destinations. What you're trying to achieve may require using redstone timing circuits to control hopper or hopper-minecart activity.
Three things are going on there, I think.
Logically two hopper-minecarts under a container can only pull an equal share of items from that container if there are multiple items in the container to begin with, or if items are being added to the container at twice the rate that each hopper-minecart is pulling.
The game likely processes entities actions in the order that those entities were added to their chunk's data. So I would guess that you placed the hopper minecarts left-to-right, and that entails that for any pair, the hopper-mc on the left will always pull before the hopper-minecart on the right. That's why you're seeing the leftward bias in where items end up.
There is a bug causing diagonal pulling by hopper minecarts in some directions: MCPE-57637. That may or may not be impacting what you've built here.
Based on (1) and (2), what you're seeing isn't a bug, its just a logical consequence of what you've built and how the game works. There are other ways to split items from one container to multiple destinations. What you're trying to achieve may require using redstone timing circuits to control hopper or hopper-minecart activity.