Log files misnamed

[Baron Schwartz]

I have a RollingFileAppender configured as follows:

    <log4net>
        <appender name="FileAppender" 
type="log4net.Appender.RollingFileAppender">
            <file value="//tank/logs$/seo/log-" />
            <appendToFile value="true" />
            <datePattern value="yyyy-MM-dd'.txt'" />
            <rollingStyle value="Date" />
            <staticLogFileName value="false" />
            <layout type="log4net.Layout.PatternLayout">
                <conversionPattern value="%-5p %d %c line %L%n 
%m%n" />
            </layout>
        </appender>
        <appender name="SmtpAppender" type="log4net.Appender.SmtpAppender">
            <to value="[edit]" />
            <from value="[edit]" />
            <subject value="SEO error" />
            <smtpHost value="madrid" />
            <bufferSize value="2" />
            <lossy value="true" />
            <evaluator type="log4net.Core.LevelEvaluator">
                <threshold value="WARN"/>
            </evaluator>
            <layout type="log4net.Layout.PatternLayout">
                <conversionPattern value="%-5p %d %c line %L%n 
%m%n" />
            </layout>
        </appender>
        <root>
            <level value="ERROR" />
            <appender-ref ref="FileAppender" />
            <appender-ref ref="SmtpAppender" />
        </root>
        <logger name="SeoLibrary">
            <level value="INFO" />
        </logger>
    </log4net>

It should (and usually does) produce files named thusly:

log-2005-06-27.txt

But every now and again, when I restart the service that's doing the 
logging, it makes a new file named incorrectly:

log-2005-06-27.txt2005-06-27.txt

What do you think?  It's not a real problem for me, but maybe it is a bug.

Thanks
Baron