Here is my logback.xml file to see if you can find any other differences. When I uncomment the Nest or Zwave loggers all those logs only go to that file.
<configuration scan="true">
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%-5level] [%-30.30logger{36}] - %msg%n</pattern>
</encoder>
</appender>
<appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${openhab.logdir:-logs}/openhab.log</file>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<!-- weekly rollover and archiving -->
<fileNamePattern>${openhab.logdir:-logs}/openhab-%d{yyyy-ww}.log.zip</fileNamePattern>
<!-- maximum number of archive files to keep -->
<maxHistory>30</maxHistory>
</rollingPolicy>
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%-5level] [%-30.30logger{36}] - %msg%n %nopex</pattern>
</encoder>
</appender>
<appender name="EVENTFILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${openhab.logdir:-logs}/events.log</file>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<!-- weekly rollover and archiving -->
<fileNamePattern>${openhab.logdir:-logs}/events-%d{yyyy-ww}.log.zip</fileNamePattern>
<!-- maximum number of archive files to keep -->
<maxHistory>30</maxHistory>
</rollingPolicy>
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss} - %msg%n</pattern>
</encoder>
</appender>
<appender name="ZWAVEFILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${openhab.logdir:-logs}/zwave.log</file>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>logs/zwave-%d{yyyy-ww}.log.zip</fileNamePattern>
<maxHistory>30</maxHistory>
</rollingPolicy>
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%-5level] [%-30.30logger{36}:%-4line]- %msg%n</pattern>
</encoder>
</appender>
<appender name="NESTFILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
<file>${openhab.logdir:-logs}/nest.log</file>
<rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
<fileNamePattern>logs/nest-%d{yyyy-ww}.log.zip</fileNamePattern>
<maxHistory>30</maxHistory>
</rollingPolicy>
<encoder>
<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%-5level] [%-30.30logger{36}:%-4line]- %msg%n</pattern>
</encoder>
</appender>
<!-- Change DEBUG->TRACE for even more detailed logging -->
<logger name="org.openhab.binding.zwave" level="INFO" additivity="false">
<appender-ref ref="ZWAVEFILE" />
</logger>
<!-- <logger name="org.openhab.binding.nest" level="TRACE" additivity="false">
<appender-ref ref="NESTFILE" />
</logger> -->
<!--<logger name="runtime.busevents" level="ERROR" additivity="false">
<appender-ref ref="EVENTFILE" />
<appender-ref ref="STDOUT" />
</logger>-->
<!-- <logger name="org.openhab.persistence.mapdb" level="DEBUG" /> -->
<logger name="org.openhab" level="INFO"/>
<!-- this class gives an irrelevant warning at startup -->
<logger name="org.atmosphere.cpr.AtmosphereFramework" level="ERROR" />
<!-- temporary workaround for https://github.com/openhab/jmdns/issues/12 -->
<logger name="javax.jmdns" level="OFF"/>
<!-- temporary workaround for https://bugs.eclipse.org/bugs/show_bug.cgi?id=402750 -->
<logger name="OSGi" level="OFF" />
<!-- temporary workaround to circumvent error messages with any obvious effect -->
<logger name="org.atmosphere.cpr.AtmosphereFramework" level="OFF" />
<logger name="org.atmosphere.cpr.DefaultAnnotationProcessor" level="OFF" />
<!--<logger name="org.openhab.binding.zwave" level="TRACE"/> -->
<!--<logger name="org.openhab.io.transport.mqtt" level="TRACE"/> -->
<logger name="org.eclipse.jetty.io.nio" level="ERROR"/>
<root level="WARN">
<appender-ref ref="FILE" />
<appender-ref ref="STDOUT" />
</root>
</configuration>