Bug/Issue Museum Items Disappear

Me (host of game) and one of my friends have lost everything that has been placed in the museum (over 60 items) after they tried to rearange everything. It was straight after the rearange that all the items had vanished. It happened twice as the first time only a few items vanished but the were being moved aswell. We even tried to put the items back into the museum and eventually got it to over 60 items but we did not reveive the rusty key for the sewer so that area is now completely locked off.

I have uploaded the save file to see if anything can be grabbed from it.