The email log was interpreting those symbols as "unsafe" HTML (i.e. an attempt at cross-site scripting); this paranoia in this case isn't necessary as messages are plain text only. There is a fix at http://pkp.sfu.ca/bugzilla/show_bug.cgi?id=2673
that will relax the restriction. Note that the full emails are stored properly; once the fix is in place, the rest of the any affected past emails will appear.
Open Journal Systems Team
Don't miss the First International PKP Scholarly Publishing Conference
July 11 - 13, 2007, Vancouver, BC, Canada