Kindly turn off Auto replace in Samsung keyboard settings then try to it's again. If you like please accept as a solution it's help to others users also, click on 3dots in my reply section and click on accept solution. Thanks.
Please follow these easy troublshooting steps which may help in resolving this issue and We are taking your valuable feedback regarding the keyboard.
● Clear app cache through Device care: Tap on Settings>Device Care> Storage> Clean Now.
● The clear cache memory of a particular application: Settings > Apps > Now pick the app that you like to clear off the cache memory > Storage > Clear Cache.
● Reset keyboard: Settings> General Management.>Language and Input> On-screen keyboard> Customize a keyboard> tap on the keyboard name. For this example, tap on Samsung Keyboard> reset to default settings.
