So, my posts all appear on PC tumblr, but the second you go to my blog on mobile Tumblr three of my posts done appear whole you scroll through my blog, does anyone know why this is happening or how to fix it?

I think you have to refresh it by pressing on the little picture square again at the very top where the name of your blog is. The little square with the picture in it. That's what I have to do on my mobile tumblr blogs I follow on art.