The following indicate that their are invalid words in the names. What are the invalid words?
This person https://www.familysearch.org/tree/person/details/LVPG-HQL who is connected to all these PIDs listed above had in her name field the years of birth and death and also had her name set to to the Bulgarian language using Cyrillic. I changed it to English and removed the years from the name. It looks like the error notification of invalid words is now gone.