hi Communication Contact,
if you subscribing into post, it will subscribe into the whole category of those post.
so if you write a post without category on the post, you won’t get any notification.
this feature is good if your website having alot of category. for example people that subscribe with Business category, won’t get any Fashion category push notification.
if you don’t like this option, you can disable jnews push notification and use one signal only. so people will get notification whatever post category you posted.