Sorry I have been away- maybe I can help
Try making your image 1386x721 or somewhere close that works out- thats a good default for FB sharing
If you want EACH page of your site to show the content for THAT PARTICULAR page then you may need to define the meta data for Facebook manually ( I do this on EVERY post) typing it here may seem complicated buts its really not and can be done in just a minute or two
You this code to begin with
<!-- Facebook OG -->
<meta id="ogtitle" property="og:title" content="ADD YOUR ARTICLE/POST TITLE HERE BETWEEN COMMAS"/>
<meta id="ogdescription" property="og:description" content="ADD YOUR ARTICLE DESCRIPTION HERE BETWEEN COMMAS"/>
<meta id="ogimage" property="og:image" content="NOW USING CHROME-RIGHT CLICK ON THE IMAGE IN YOUR ARTICLE YOU WANT DISPLAYED AND SELECT "COPY IMAGE ADDRESS" THEN PASTE THAT ADDRESS HERE THEN CHANGE THE IMAGE SIZE TO 800 ( CHANGE IT NO MATTER WHAT SIZE THE IMAGE IS IN YOUR ARTICLE-THE 800 DISPLAYS GREAT ON FACEBOOK POSTS"/>
<meta id="ogurl" property="og:url" content="ADD THE URL OF THE WEBPAGE HERE"/>
When you get the above code altered then copy it and go to the page the code represents THEN go to SITEBUILDER>PAGE CONFIG> and select the PAGE SETTINGS tab...there you will see a box that says PAGE HEAD HTML....paste your facebook data there and save/exit... then go to
and enter the page URL into the debug box and hit the debug button THREE times...this forces facebook to rescrape your page data...scroll to the bottom and you should see how its displayed...I need to make post an article soon here I will take a screen video...it seems complicated but it really only takes a minute- just remember to save the above FACEBOOK OG code above to a notepad file- then open it and reuse it each time altering the information as needed