Hi, Jim-
Thaaat is a pretty classic version of AFNI---is it really from 2017?? I would strongly recommend updating your version, to have many new features and probably helpful fixes/updates. I know that table reading has improved lately in 3dMVM, for example.
Re. the wonky features: well, please try the code formatting with putting multiline code between triple backslashes and "inline code" between single backslashes, as described here. I wrapped some of your code text in your post with that, but it will surely be useful for future posts.
I will let @Gang comment on the details of 3dMVM.
--pt