log4j appender only sending my messages to stdout, but not remote GELF appender

I'm having a strange issue where log4j is correctly displaying all my log messages the console, but is only sending log messages to my graylog server that I am not writing (e.g. a library I'm using which writes to log.info will show up in graylog, but not any of the messages I write with log.info). What am I missing

Here's my logback-spring.xml

<configuration>
    <contextName>test</contextName>
    <jmxConfigurator/>

    <springProfile name="dev, test">
        <appender name="gelf" class="biz.paluch.logging.gelf.logback.GelfLogbackAppender">
            <host>udp:localhost</host>
            <port>5555</port>
            <version>1.1</version>
            <extractStackTrace>true</extractStackTrace>
            <filterStackTrace>true</filterStackTrace>
            <mdcProfiling>true</mdcProfiling>
            <timestampPattern>yyyy-MM-dd HH:mm:ss,SSS</timestampPattern>
            <maximumMessageSize>8192</maximumMessageSize>

            <includeFullMdc>true</includeFullMdc>
            <filter class="ch.qos.logback.classic.filter.ThresholdFilter">
                <level>INFO</level>
            </filter>
        </appender>
    </springProfile>

    <appender name="stdout" class="ch.qos.logback.core.ConsoleAppender">
        <layout class="ch.qos.logback.classic.PatternLayout">
            <Pattern>
                %d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n
            </Pattern>
        </layout>
    </appender>

    <logger name="com.test" level="info" additivity="false">
        <appender-ref ref="stdout" />
    </logger>

    <root level="INFO">
        <appender-ref ref="gelf" />
        <appender-ref ref="stdout" />
    </root>

</configuration>

I'm instantiating my log by doing:

 private static final Logger logger = LogManager.getLogger(MyClass.class);

And writing to my log:

 logger.info("WHY CAN'T I SEE THIS IN MY GRAYLOG SERVER");

Edit: Your are specifying that the loggers of the package com.test should only write to the stdout appender.

<logger name="com.test" level="info" additivity="false">
   <appender-ref ref="stdout" />
</logger>

You should change it to:

<logger name="com.test" level="info" />

Make sure that you are running your app with the matching profile for your gelf appender.