Attached is an mdat file with 16 measurements. Each time I load it into REW V5.20.9, and look at Clarity or RT60, either in the main graphs or in Overlays, and select a point on the graph, I don't see data in the legend for most of the measurements, but it's a somewhat random set of measurements affected each time I load it. For example, here's a Clarity Overlays, where only the last measurement gets updated in the legend:
Here's the main Clarity graph for a different measurement, with no legend update:
And here's a main RT60 graph, where none of the data has been populated:
Here's the main Clarity graph for a different measurement, with no legend update:
And here's a main RT60 graph, where none of the data has been populated: