为什么我的服务没有正确地加载到我的一个控制器中?

I've built my personal website with the MEAN stack and built a backend with an online MongoDB to store all my site's content. I then created a service in angular named 'contentService' to grab all the content via the API. I have 5 pages on my website, and on 4/5, the Content loads properly when I inject my 'contentService' into the controllers. I've built my personal website with the MEAN st