This has happened often before and, in past, I’ve had to reinstall it. Maybe there is a way to fix without going to this much trouble.
I’m typing and I have misspelled a word. I place the cursor over the letter that needs to be corrected and highlight it. Then, when I type in the new letter, the next letter in the word (a correct letter) is removed and replaced by the new one and this continues over and over. There is no way to correct the misspelled word. I just continues to be obliterated. I don’t know if I have explained this so that it can be understood (it’s difficult) but maybe someone understands and has experience with the issue. If not, I’ll try to explain it again.

Does anyone understand?