Multiselect dropdown data not display in subpanel

In one of my module say (module1) I have a custom multiselect dropdown field. module1 is in M:N relation with module2. The multiselect dropdown field data is displyed in edit,list & details view of module1 but it does not displayed in the subpanel for module1 under module2 record.

Have you went into studio and added it to the list of displayed fields for that subpanel?