As the country name was changed several times each day and many were cancelled, it is impossible to see even if the country was not cancelled and another one replaced it.
Wars represent a high cost. many wars even a higher cost.
There are at least 50 factors that can change the score.
game level is a major factor but setting war protection is another, that has a small influence, accumulating during a longer period.
The score however is accurate.
I suggest that you check indexes in that period on the history data tables that are available for everyone to see and compare them to find out how the difference came about.
We will add info on the score and its factors but as I said before, there are many factors.
If you have turned on temporary war protection, or it was on and your war level increased, this would lower your score.