Unexpected ellipsis in syslog or splunk message

I am logging data to Splunk via log4j and a SyslogAppender. Sometimes the information shows up in Splunk with ellipsis (...) instead of the actual text with some odd spacing. When I log the same event to a RollingFileAppender, it logs normally. Would anyone know why this is happening and how to resolve it? Thank you!

Example: InboundTxnDate: 20130926 16:53:14:475 Out... ...boundTxnTypeCode: UNK