Why there are 2 root moudules in my project while I only set one in my pom.xml?

HI,

I set only one root moudule in my pom.xml.

<groupId>cn.homecredit</groupId>
<artifactId>sms.helpdesk.message</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>pom</packaging>

<modules>
  <module>sms.helpdesk.message-conf</module>
  <module>sms.helpdesk.message-sql</module>
  <module>sms.helpdesk.message-web</module>
</modules>

But as you can see as below, in Project Structure, there are two root moudules, one is sms, and the other one is trunk. How does this come?