It seems that the boxes rolled back an hour or so, moving back to a location they previously were. This put them firmly inside of Blacksmith tables, poking out by a few pixels which gave away their location. Obviously Blacksmith tables did not roll back for whatever reason.
I remember hearing rumors of a bug that if you use the new “Move” functionality on placeables, then quite often they will jump back to their initial location, especially on official servers (at least I never had it on my private server or SP)
If that’s the case then it’s most probably an already known issue