Factorio Forums

i noticed this:

the right belt only has stone on one lane, that lane is then overcompressed on the output lane which is proritized

Edit: seems like only the input priority is important.
it also only overcompresses when the belt is backed up at its end and everything stops on it

Do you have a save?
I probably found a cause of this, but it would be nice to check if it fixes your case as well.

https://drive.google.com/drive/folders/ ... sp=sharing
its with my mod, but that only adds recipes and changes chunk generation.

In this video I can see there is a lot of extra item movement happening of items compressed by inserters on the prioritized input lines. This can cause some issues I suppose,

I can confirm, that it is fixed.