@Markvl If I uncheck IfcWallStandardCase, the text in the Description box is deleted. If I uncheck Pset_WallCommon, the text in the Mark box is deleted. When I retype them, the items are checked again.
Looking at IfcWallStandardCase > Description, it shows what I typed into the Description box. But that still isn't what appears on the schedule (most of the time).
Also, if I don't summarize the Mark column, I find that the same wall can show multiple Descriptions. Some of which are the actual description I typed in!