sirslayalot on "Facebook share button not displaying images"

Hi all,

first of all I would like to mention that I am relatively new to WordPress.
Like the topic says, I have a small, but nevertheless annoying problem with the Facebook share button.
The problem is when I click on the "share" button, I get redirected to Facebook with the Article Text and Link but strangly can't always see the images.
Sometimes I can't choose any images, sometimes only 1 and sometimes I can choose all images from the article. I also can also get different results when I click on the button again.

Am I doing something wrong with the creation of the images?
Is there anything that can be done to solve my problem?

Thanks for any help I may receive.