Messages Scrambling words on MacBrook Pro

Using a MacBook Pro 2017 macOS Big Sure: when I type a text (often when it's a longer text) using Messages, it will randomly start to scramble my words up that I have typed. No reason I can come up with that it is doing this - it's like once a text gets to 1 paragraph or several sentences in length, it just randomly scrambles up some words (into nonsense words) and moves letters around. It just continues to get worse scrambling words as I continue to type. Sometimes if I click out of messages into another program and then go back, it will stop scrambling long enough to type my message and get it sent out. I have shut down/restarted my laptop to no avail. I think it was doing this before I upgraded to BigSure a few months back as well. I've had this computer since 2017 and it did not do this until some time during this 2021 year. Help?!!