Unable to edit imported transaction groups

I’ve got a few nearly identical transaction groups, so I created the first one, exported it as XML, edited it as I saw fit, and tried to import it. The import itself went fine and the group works just fine, but for some reason the designer will not allow me to edit any of the items in the group. If I double click on an item, nothing happens. If I right click and select edit, nothing happens. However, if I try to edit an item in the original group that was created through the designer from scratch, I can edit those items just fine. I’ve tried restarting the designer and even the ignition gateway itself, same result.