Because of the lag from the server saving and i was moving things in my inventory it caused me to accidentally throw 20 hoppers over the edge.
Not much you can do about that its not really a bug its more of the auto save which is required, I dont beleive you can retreive your items but in the future highly suggest that you dont move when the server auto saves its what I do and usually works for me
I believe you're talking about the auto-save which does cause some lag. This is normal. I am sorry about your items, though. Has your question been answered?
You can read this guide to fix lag in Minecraft and see if any of the steps mentioned would help you through. Gladly most of the problems at my end are at peace now. Probably you're facing rubberbanding.