What to do about formatting errors?

I have been playing along with an adventure for almost a week and today it suddenly decides to omit the words and, a, the, or, and others. It leaves out commas and periods. Change from 'what do you do?' To What does Thom do?' But get this, it's only like the last 20 or so lines. The first part is correct.

Using Deepseek. I went back and edited the summary and all of the posts, fixing all of the errors but it persists.

Just delete and start over?