Site link on Facebook shows the wrong SEO and no image

Hello,

When I post a link to my site on Facebook, for example, the image is blank (it has the grey, “person” icon within it). Before changing to this theme it used to show an image, or give me a selection of images to choose from before posting. The SEO description underneath the link is also wrong. It’s just taking text directly from the homepage. It’s also taking the word “edit” and “discover” and putting those in the middle of the description (I’m assuming “edit” comes from the link above the main banner when you’re logged in and “discover” is being taken from the button I created on top of the banner).

I’m using the All in One SEO plugin.

Any insight on how to edit both the image and text attached to the homepage when it’s linked would be much appreciated. Thanks.