Display homepage elements inline on mobile

Hello !

My site: http://www.bloggerspoint.dk looks great on desktop, but for some reason some of the posts/boxes on the homepage, jump to the next line, instead of being on the right one.
I have attached an image, so you can see what it looks like. I have tried a lot of different CSS styles, but can't find anything that works, so I really hope you can help me out here, as my homepage looks messy on mobile.