I wasn't sure where to put this so sorry it's here but I thought it'd benefit people.
I have discovered that this forum does not like the 15th Japanese character in a body of text. If you look closely, each 15th character below is not recognised and displays as a random series of characters and numbers.
But, simply putting a space before the 15th character resolves it. What's strange is that the second error above (戦) was automatically fixed after putting the first space in to fix (書) but it also brings in errors further on down. Below the fix above has been put in but now there are some new errors