Why does the API URL title on the sidebar of my API documentation keep changing?

I keep changing the title from API URL to API Documentation because I wanted to change the way it looked and it keeps returning back to API URL. I change the text, it saves it automatically and then I check on the preview of my documentation site, but when I come back the next day, it is back to API URL. I am the only person writing API documentation and none of the other two on my account have changed anything. What's going on? Am I not supposed to change that text?