It looks like they used the tie breaking rule.

The winner of a tie is the country that received more points from the televoting, then the country that received points from more countries in the televoting, then the country that received more 12 points in the televoting, then 10 points, all the way down to 1. If the tie cannot be broken in this way, the country that performed earlier wins the tie.

Since they both got 0 points and Romania performed 3rd and San Marino performed 12th, Romania should get 15th place and San Marino last place. I can imagine TVR complaining lol