Why would a post leave out images you have selected to post?

I've been trying to make a post of five images but only three of the five continuously show up. The other two don't appear and there is not even a notice on why.

I already get annoyed with posting on this garbage ass site when it will not follow the arranged order you put the images in. But now, it isn't even posting all the images for me and not even giving notice why.

Anyone have any advice that can help or at least explain why this is happening?