I'm sorry, but there's not really much to "fix" in this case.
The safe is not the result of a housing placeable deed; it is permanently placed in the area and is therefore not persistent or suitable for storage. As a general rule of policy, we don't allow any custom objects in housing and guild halls due to problems we've had in the past, so we won't be turning it into a means of persistent storage. You can use housing crates/chests for this purpose.
Best we will do is to make it a static (non usable) prop so that it's not confusing later on, but that's as far as we'll go.