the_excerpt not showing text only pictures

I am trying to create a news page and I am using the_excerpt and I have the length set to 20 and the I have modified the read more tag. But It is showing up very wrong. I have used it before and it has worked perfectly now it is showing a copy of the featured image some text and it does not add the read more on every post. On the first on it only shows a random image from the media gallery that is not even in the post.