Columns not being retained

When I select some custom metadata columns in the View pane in DT (Pro) 3.6.2 on macOS 11.2.1 they are not retained when I leave the group by clicking on a different group and then return to the original group (in which I had selected the column). This behaviour is regardless of which View is selected and occurs in groups, smart groups and global smart groups (ie everywhere I have tested). Other custom metadata columns are not affected. There is no obvious pattern to which ones are, and which are not affected. Any ideas? Thanks :slight_smile:

What data type are they?

One which isn’t retained is “single-line text” (but a different one of the same type is retained), another is “date”