The header was there and then……….

I just installed this theme last week. The full page header image was there and now it is not. https://www.mooncavecrystal.com/2017/04/22/introduction/ It was a full image 2000 x 1193. You saw this entire image first before scrolling down to the blog articles, etc. Now, all of a sudden this week, there is only a thin portion of the image, like a small banner???? I did not change anything so this is confusing to me. I checked all my settings. I thought it may be because I added a primary menu, but when I removed the primary menu, the same tiny thin portion is there. What happened??