Can't make format changes

[Jakki]

For some reason, Word is re-formatting things I type (like
underlineing and making text red!) and I cannot undo these
chages, even by deleting and starting over!
Also, it puts the> instead of ., even with no shift key
pressed.
Help!

 

[Suzanne S. Barnhill]

Turn off Track Changes and Accept All Changes in Document.