Goldiethere isnt really a way of doing this except for deleting dozens of plugins and then waiting for a few days and then check again which will take weeks or months and during that time the plugins arent working so the server doesnt gain anything by doing this.
It could really be any plugin
Brokenitemscleaner removes thousands of useless entities everyday. It does not break any of the guns that are inside boxes, coffins, lockers or inventories. However it does break all guns that are in backpacks at the moment it runs.
Backpacks is still working as it should with no problems regarding "broken" items (?), All weapons are working as they should, it is something in the way you have your server set up that is giving you all the problems, I have never been able to reproduce the errors you post and there is not one person who has as many problems ! as the previous poster advised go through your plugins and settings to find the problem plugin and maybe post a list of plugins you have , type "plugins" in rcon and copy paste the result to see which plugins are causing problems,