There is ambiguity in the list of nationalities.
The Commonwealth of Dominica, known as Dominica, is an island republic in the West Indies. The nationality (demonym) is Dominiquais, according to Wikipedia.
The Dominican Republic is a republic in the Greater Antilles which shares the island of Hispaniola with Haiti. The nationality (demonym) is Dominican, according to Wikipedia.
UKCH has two nationalities in its official list:
2. Citizen of the Dominican Republic
I suggest, to avoid errors on company formation and appointment of officers, that you change "Dominican" to "Citizen of Dominica". The population of Dominica is about 74,000, while the population of the Dominican Republic is about 10.3 million, so there should be about 139 times as many directors from the Dominican Republic as from Dominica - but I will bet that many directors from the Dominican Republic have chosen "Dominican" as their nationality, since that is what they call themselves at home.