The discount for the decorative constructions is visually reflected above both active and passive defensive structures. Genuinely, it is not applied to the active defensive constructions and to EMS-72 Repair Bot.
Our developers are working on this matter. The fix will be released in one of the nearest updates.
Better safe than sorry
In case you get a discount, please restrain from the purchases of the active defensive structures and EMS-72 Repair Bot until the issue will be fixed.
If you had faced this matter just before reading this article, please submit a ticket and we will help you.