This just information for mod developer.

Ticket was almost made on FTB Revelation Bug @ https://forum.feed-the-beast.com/threads/yabba-item-duplication.278025/

When have ME Import Bus connect to Yabb barrel and use chest transporter you get barrel in transporter (like you should) and drop item of barrel on floor.

Mod & Version Yabba 1.1.0.9
Applied Energistics 2 rv5-stable-11
Chest Transporter Version 1.12.2-2.8.8 (2.8.8)

Link to log file

Is it repeatable? Place yabba barrel (antibarrel or iten barrel) under ME Import Bus. (ME should be connect to ME system).
Try pickup barrel using chest transporter, which mine was obsidian level

Known Fix Update Yabba most likely

Already fixed