Android Retrofit - Sending String Body to BE in weird formatting

Question

So I try to send String:

"Võru"

But it is sent to the backend as:

"Võru" 

Any special settings I need to set for Retrofit when working with different characteristics in strings as seen in the example?

return Retrofit.Builder()
        .validateEagerly(true)
        .baseUrl(baseUrl)
        .addConverterFactory(MoshiConverterFactory.create(Json.engine))
        .addCallAdapterFactory(RxErrorCallAdapterFactory.create(errorTransformer))
        .client(httpClient)
        .build()