Post Carousel won’t show posts and responsive image thumb

Hi,

i have a issue with post carousel. It only shows 10 posts. When you scroll to the right it won’t show all the other postst. So visitors will think there aren’t any more posts, but there are! If you keep clicking the navigation then suddenly the posts do appear.
I know that but as sayed before visitors won’t! It seems to me that it’s a lazy load problem or something?

Also, i would like that the images displayed are somewhat more responsive. Some pictures show very crooked.
Could you please help me out with this?

A link to a page where i use the carousel:
http://www.dianemeyboom.com/2017/miniatuur-olieverf-schilderijen/de-portretjes-van-rembrandt/