Currently with max upgraded Elite factories and Ultimate Logistical Transporter it only takes for the last two slots and clogging up the rest like bellow. I don't know if it is a bug or something i'm doing wrong.

Recreated with only mekanism installed

Currently running 8.1.9.265

Reproduced in 8.1.9.267

issue recreated with all Factories.

question.... is your elite factory set to auto eject instead of just having the logistical transporter 'pulling' items out? Just wondering because if its just the logistical transporter 'pulling' the items out, its possible it may not be able to keep up with the factory at full upgraded speed.

It was the issue fixed now. Sorry for the inconvenience i never got the hang of the auto eject function but I understand now thanks.

I'm having the same issue, with all combinations of pipes pulling or not pulling and auto-eject on or off. It seems to only be exporting from one output slot at a time rather slowly, so that once all slots have started processing it only outputs from the last two slots as items fill up all the other outputs. Running 9.4.13.349 in the Automaton modpack