Re: Text message help please
It may be the app you're using. I say this because it sounds like issues I've had in the past with app badges and other similar alerts to unread messages. Some won't go away until they are swiped from the notification bar, even if the app was opened and messages read. Seems silly but for me this was something caused by the app.
I have a watch 4 so it could be something with the watch 5 OS but I don't have this issue with Next SMS. Does your app have a watch companion app? I've only used Next on my watch so it's all I know.