Yes, that was known issue, can you try apply this following css code into
JoomlaFolder/templates/rt_afterburner2/html/com_easyblog/styles/custom.css and see how it goes?
div#fd.eb .eb-entry-article .eb-image.eb-post-thumb.is-center {
display: block !important;
}
Note : you have to manually create those folder and file.