My Wyandotte is also the only one that lays those kind of eggs out of eight! I also worry about her health and hope she doesn’t get sick because of this.She didn't lay an egg today :-( She doesn't seem to have a messy vent. It just kind of mystifies us since the other two hens never had this issue. They just started laying perfect eggs and have ever since. Oh well. As long as she is not uncomfortable we are ok with her not laying every day.