Since the last update whenever I type into notes each character I type is randomly followed by either an exclamation mark or a random word. For example if I wanted to type "bits" I would get b!I!t!sand. I did post something a couple of days ago and got a reply asking me to reset the keyboard in settings which I did but hasn't worked. Whoever replied to my post asked to let them know if it was successful but I've no idea where I made the post or where I would find their reply.
I have this same issue, and it's driving me crazy. Samsung S8, whatever latest update to the Samsung Notes app, adding random characters when I try and type and only have this issue in the Notes app.