I am doing some articles editing on the frontend, where I came across an issue. Some of the articles cannot be saved and Joomla returns the message "Field required: Category.
Of course the articles belong already to their category, but the issue for those specific articles is that the Category Select field is disabled in the form (showing their category- but disabled).
I just noticed that the language select is also disabled for those articles.
<select id="jform_catid" name="" class="inputbox" required="" aria-required="true" disabled="disabled">
What could cause the select field to get the disabled attribute for some random articles?