Greetings, Admiral.

We identified an issue where after completing a Warship Carrier Research,
reconnecting to the game resulted in the research category to disappear,
and this issue has just been fixed.

We sincerely apologize to everyone for the inconvenience.
Please see below for more details on the fix.

■ Issue
 - Completed Warship Carrier Research category disappearing after reconnecting.

■ Fix Implemented
 - Recovered researches that disappeared due to the issue
 - Returned the currency used for duplicate researches

We promise to improve our service to be more stable for your best experience.

Thank you.