Since my Lt Commander got her tier 2 escort (I don't remember when exactly, at least 2 weeks ago, more probably 3), there is a bug with the NCC number. It appears correctly on the front of the ship but bugged everywhere else.
Please make sure to file a Bug Report as well (with a nice screenshot of your ship) and link to the screenshot you posted here. I know that errors being reported in that thread are being examined and fixed as quickly as possible.
We fixed this for all new Escort 1 ships created, however the current fix will not fix your existing Escort 1 ship. There is a work around though. If you go to the tailor and recreate your ship or at least change the parts to a different type and then change them back that should fix the issue. You should see the fix work as you change parts.
We hope to have a better solution in soon. Let me know if this does not work for you.