Every time I use the Scycks special slot to add a cannon on serissu and save the squad the upgrade drops from her next time I open the app. The points value on the list retains the upgrade but serissu's ship total drops down. The upgrade doesn't show up on an exported PDF either. I'm using the android version of the app.

The same thing happen on every M3A interceptor (Scyck) with every kind of "Special" (cannon, torpedo or missile) upgrade. I also use the android version of the app