Noticed this issue in the Ultimate Alchemy Pack, recreated on a new profile with Forge 14.21.1.2442 and Extrautils2-1.12-1.9.8.
This happens after placing a Flat Transfer Node, both fluid and item. If you then move items in your inventory, while it is visibly moved, it will not actually do so and if you attempt to place it, it will place what was there before.
My Log File
Noticed this issue in the Ultimate Alchemy Pack, recreated on a new profile with Forge 14.21.1.2442 and Extrautils2-1.12-1.9.8.
This happens after placing a Flat Transfer Node, both fluid and item. If you then move items in your inventory, while it is visibly moved, it will not actually do so and if you attempt to place it, it will place what was there before. My Log File
The issue starts on line 344.
You can see this happen in this video at 17:30.