Adjustments have been made to Engram rewards. Opening Engrams now gives you a higher chance of receiving a new mod that you don't own yet. This makes the process more rewarding and makes it much easier to complete your mod collection.
It is still possible to receive duplicates, of course. Because of these changes, you will probably see more mods for ships you don't play or haven't unlocked yet, partly because you own less mods for these.
Good luck opening those Engrams and be sure to share your overpowered or unconventional mod setups!