Do you have any idea why this is happening?
I have had it since ForceWipe but have not added any plugins.
Unfortunately the video is too big:
https://www.swisstransfer.com/d/12b6ab91-2241-45ea-a15b-20ecb63ac14b

Problem is that when a player inserts an item into the backpack with right click or hover loot all items that are the same are moved over at once?

I've never seen anything like this. There isn't any logic in backpacks that overrides the behavior for transferring items, so I would suspect another plugin.

If this is a widespread issue affecting multiple servers, then maybe something changed in Rust that somehow affects only the backpack container, but haven't seen other reports of this issue (yet).

ok no problem i will wait

I tested and couldn't reproduce this issue. I checked the latest Rust code and don't see any logic that would cause this. I suggest you test with only Backpacks loaded, and assuming it doesn't happen then, test with other plugins to see which combination causes it. The troubleshooting process won't take very long if you simply divide the number of plugins you are testing by 2 each time (e.g., test with one half of plugins, then test with the other half, then keep breaking down the list by half).

okay thy