My Stuff disappears from create item vaults. I can put stuff in through the terminals, and after a server restart, or logging on after a day or 2 some of the stuff will disappear. Some of it will disappear completely, or it will be in smaller amounts. it's kind of random.

Please post your minecraft log.
It could be that the vault isn't saving its contents, similar to #360.

2024-04-16-1.log.gz
Here it is, the problem went away when I changed to the previous version.

Ok, I grabbed the log from the wrong month. The mod I use to force load chunks is Create: Power Loader (Fabric).
2024-05-17-1.log.gz
2024-05-17-2.log.gz

The log doesn't have Tom's Simple Storage installed.
But you have open parties and claims, it looks like based on the linked issue, that forceloading with the mod doesn't save create vaults. It could be a create fabric issue or an open parties and claims issue.