Don't know if this is a mod issue or a modpack issue, but a few friends and I are playing on a private server and someone tried using a weather accumulator by throwing a weather container on it from evilcraft, the item disappears and anyone nearby suddenly gets kicked from the server, only fixed by a server reboot which reverts the chunk. A friend checked and confirmed the same problem in single player as well.

looks like this was reported to the evilcraft devs but was auto closed due to the report not following the template, if you can please report it to the mod devs following their template, and then also reference the below issue

CyclopsMC/EvilCraft#925

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.