Hovering/ levitating gold above treasure room

Graphical error occurring on my HoG level 4, they appear on the single treasure room blocks around the lava like shown here: 1
and if I sell the room the gold is in its normal position, however upon new placement it hovers again: 2
If I save and reload the save I can fix current placed rooms, however as I progress through the level and create similar treasure room blocks; the levitating gold comes back.