Hi
You could try this.
Edit the file:
plugins/system/zenshortcodes/zenshortcodes.php
Look for
$output = str_replace("{zen-".$key."}".$match."{/zen-".$key."}", $code , $output);
Change to:
$output = preg_replace("/{zen-".$key."}".$match."{\/zen-".$key."}(?=[^\"]*(?:\"[^\"]*\"[^\"]*)*$)/", $code , $output);
$output = str_replace(["{zen-".$key."}", "{/zen-".$key."}"], ['', ''] , $output);