Warning about private module use issued twice

My web app is using some modules of WildFly AS which are not public.
The warning about using private modules is issued twice for every module:
09.11. 22:07:34,088 WARN org.jboss.as.dependency.private#start WFLYSRV0018: Deployment "deployment.web-maj2e-langfr-dev.war" is using a private module ("org.jboss.common-core:main") which may be changed or removed in future versions without notice.
09.11. 22:07:34,090 WARN org.jboss.as.dependency.private#start WFLYSRV0018: Deployment "deployment.web-maj2e-langfr-dev.war" is using a private module ("org.jboss.common-core:main") which may be changed or removed in future versions without notice.
09.11. 22:07:34,091 WARN org.jboss.as.dependency.private#start WFLYSRV0018: Deployment "deployment.web-maj2e-langfr-dev.war" is using a private module ("org.apache.commons.collections:main") which may be changed or removed in future versions without notice.
09.11. 22:07:34,091 WARN org.jboss.as.dependency.private#start WFLYSRV0018: Deployment "deployment.web-maj2e-langfr-dev.war" is using a private module ("org.apache.commons.collections:main") which may be changed or removed in future versions without notice.
09.11. 22:07:34,092 WARN org.jboss.as.dependency.private#start WFLYSRV0018: Deployment "deployment.web-maj2e-langfr-dev.war" is using a private module ("org.apache.cxf.impl:main") which may be changed or removed in future versions without notice.
09.11. 22:07:34,094 WARN org.jboss.as.dependency.private#start WFLYSRV0018: Deployment "deployment.web-maj2e-langfr-dev.war" is using a private module ("org.apache.cxf.impl:main") which may be changed or removed in future versions without notice.