Hi @Danyboy20! Check that your software is up to date by going to Settings > Software update > Download and install.
After downloading the latest software update, my S21 android phone's cursor kept jumping around. It totally frustrated me. I finally set my keyboard to Italian language and it doesn't jump around anymore. The Italian keyboard is similar to the English keyboard. Wow what an easy fix!!
Did you find a fix? Exact same is happening to me.
Under Settings > General Management > Samsung Keyboard settings (on top, it will read Samsung Keyboard) > Reset to default settings > Reset keyboard settings
This took care of my A52 5G during the second last install. Now, January 23, 2023, I got another install and the same story repeated. I know, this is very frustrating and annoying. Now, if you think positive, you just found the solution to this and also likely to your emojis not showing up when they should. Have a blessed day and see if you can help someone else with this knowledge. I hope this does not create any issues with your already existing settings. I suppose this may be an insignificant price to pay in the name of sanity.