I didn't connect for one day.
The next day when I connected, I got 40 new ships on my main fleet.

in the rules it's said :

I checked the database: I can see only 20 new ships for you today.
Before these 20 ships, the most recent ships that you have are dated from 2 days ago, confirming that you didn't connect yesterday.

What made you think that you got 40 new ships today? A message?

I got the message for 40 new ships on the connection.
I will make a check again this week.

Maybe because I used a shortcut to a last batle to access the site.

Having re-checked the code, I still don't understand why you got this message

There must be a 2 or a 3 in the binary code.

I should have taken a screenshot

I'll try to recreate it