Large Chests unlock on server restart

We’re currently having occurrences of large chests (which are locked) unlocking on server restart. It seems like the same chests keep doing it, others we’ve got no problem with. Anyone else running into this issue?

How do you notice it?

The tooltip over the chest tells you if it is Open or Locked once you set it with the ‘R’ selection wheel. We’ve gone as far as double checking that all chests are locked before the reset, then checking again after. Some are ‘open’ and some remain ‘locked’.