There is an option on the Interface Edit screen for the Recurrance Policy that allows you to choose if you want to edit the recurrance policy in Additive Mode or Replacement Mode.
By default the recurrance policy are edited in Additive Mode, i.e. you add the new recurrance policies to existing policies on the interfaces selected. If you select the Replacement Mode then it will remove the original recurrance policies and relace them with the newly configured ones.
If you are asking why the existing policies don't show up when editing multiple interfaces then the reason for that is, if you are editing multiple interfaces there could be different policy on each interface and it would not be clear how you would show existing policies in that case.
Does that make sense, is that what you would expect to see?
I understand what you are saying here and the reasoning for doing it this way.
Will adjust my processing for this.