I would love to know how common this is.
I'm currently using V 19 Pro, but this has happened with earlier versions too.
I create a new Audio CD project. I add maybe 12 tracks to the Timeline.
Tools / Lay out Audio CD from Events - red track markers appear.
Tools / Burn Disc at Once Audio CD.
I burn, then when I go to check the burned CD, the music on it is from a project I did a week or more ago!
This has happened many times over the years.
Solution is to Close down Vegas, restart Windows and re-burn.
Am I Robinson Crusoe here?