Industrial Foregoing Version: 1.12.2-1.5.13-103
Industrial Meat: 1.12.2-1.02 (in modpack, just used for reference as modifications)
TeslaCoreLib Version: 1.12-1.0.11
Crashlog (If Any): No Crash Log
Mod versions go minecraft version-mod version

Issue

When using Inventory Sorter (mod by spw, version 1.12.2-1.12.4+52) to 'sort' the inventory of the Animal Feeder all items in the feeder vanish.

When used inside a Plant Sower the seeds break the 16 items limit (default) and holds stacks of seeds inside its buffer slots, the final slot (bottom right) does not break this rule.
these involve auto input from Thermal Expansion itemducts.

Same for me in all IF machines (atm7 to the sky)

Thats probably a Inventory Sorter issue, its assuming that the slots have a 64 stack size and can accept any item when sorted.

Modpack is GrimCo R&D version 1.0.3

Also having the same issue with both the Animal Feeder & the Plant Fertilizer.
When middle clicking mouse to sort inventories of the machines all items in machines inventory will disappear.
Modpack: Direwolf20 1.12
Version: 1.4.0
Industrial Foregoing: 1.12.2-1.6.3-107
Inventory Sorter: 1.12.2-1.12.4+52
Tesla-core-lib: 1.12-1.0.12

Please report it to Inventory Sorter, I cant do anything about it, speacially the Slot limit skipping.

Kinda fixed in InventorySorter Side