Looks a bit like a Unicode problem.
This thread may help - there are a few others if you search the forum using "unicode".
There have been some recent enhancements to Unicode handling in Monarch, notably in V9. It might be interesting of you had a chance to try your report with V9 to see what results.
If it is not highly confidential I could do that for you if you are interested. Just need the file. I could provide and email address to send it to.