And how should I've guessed that from your first post?
Anyways, that's simply caused by the "preview" function, it only shows the first 100 chars which is in the middle of the img tag.
You can either increase the preview size or disable parsing for the preview to fix that:
Modify
inc/plugins/mybblog/modules/index.php, Line #27:
$preview = Helpers::preview($article->content);
to
$preview = Helpers::preview($article->content, [length], [append], [parse]);
[length] is the number of characters used as preview (default: 100)
[append] is the string which is appended to the preview (default: '...')
[parse] is a boolean whether or not the message/preview is parsed (default: true)
If you want to disable the parser and show the first 500 characters your line would look like that:
$preview = Helpers::preview($article->content, 500, '...', false);