Have you been inactive recently? If so, how long?

 

im having this issue also, i got off at 12 i had everything locked 13 hours later i get on and 3/4 of my locks are gone

 

Last week there was a server crash. When the server crashed it caused all the lwcs that had been locked or removed to revert to how they were a few days previously. This is because lwcs are all saved in the system at a certain time and the crash caused them to revert back to that previous point. I'm sorry for the inconvenience, I think there probably should have been an announcement so all the players could be made aware and check their lwcs, however such an announcement might have also encouraged looting. This isn't a common occurrence but I recommend you keep your most valuable items out of chests that are recently locked and in plain sight.