Something seems to be adding additional repo's partway through build?

Perhaps a newbie question, but this was confusing this morning when our build started failing with no idea of external inputs.

I have been able to resolve this by rebuilding our local from source to bring our local nexus up to date.
It seems we may need to Add npanday.snapshots and apach.snapshots to our nexus to proxy, however I can't find where apache.snapshots is defined so far.

We have these 2 repo's defined that appear like

 
[INFO] snapshot org.apache.npanday:apache-npanday:1.5.0-incubating-SNAPSHOT: checking for updates from nsl.nexus
[INFO] snapshot org.apache.npanday:apache-npanday:1.5.0-incubating-SNAPSHOT: checking for updates from public
 

Partway through artifact resolution 2 more 'appear'

 
[INFO] snapshot org.apache.npanday:dotnet-registry:1.5.0-incubating-SNAPSHOT: checking for updates from nsl.nexus
[INFO] snapshot org.apache.npanday:dotnet-registry:1.5.0-incubating-SNAPSHOT: checking for updates from public
[INFO] snapshot org.apache.npanday:dotnet-registry:1.5.0-incubating-SNAPSHOT: checking for updates from npanday.snapshots
[INFO] snapshot org.apache.npanday:dotnet-registry:1.5.0-incubating-SNAPSHOT: checking for updates from apache.snapshots
 

With recent changes overnight our build started failing and the only thing I could find is that the following cause some external updates to be applied inconsitently.

[INFO] [compile:initialize

]
[INFO] NPANDAY-148-009: Took 18ms to resolve dependencies for com.netIQ.IAM.SecureLogin:netWizardModel:dotnet-library:8.1.0-0-SNAPSHOT with
filter org.apache.maven.artifact.resolver.filter.AndArtifactFilter@4b28899a
[FATAL ERROR] npanday.plugin.compile.ComponentInitializerMojo#execute() caused a linkage error (java.lang.NoSuchMethodError) and may be out-
of-date. Check the realms:
[FATAL ERROR] Plugin realm = app0.child-container[org.apache.npanday.plugins:maven-compile-plugin:1.5.0-incubating-SNAPSHOT]
urls[0] = file:/e:/data/.m2/repository/org/apache/npanday/plugins/maven-compile-plugin/1.5.0-incubating-SNAPSHOT/maven-compile-plugin-1.5.0-
incubating-SNAPSHOT.jar
urls[1] = file:/e:/data/.m2/repository/org/codehaus/plexus/plexus-utils/1.5.15/plexus-utils-1.5.15.jar
urls[2] = file:/e:/data/.m2/repository/org/apache/npanday/dotnet-registry/1.5.0-incubating-SNAPSHOT/dotnet-registry-1.5.0-incubating-SNAPSHOT.jar
...
urls[37] = file:/e:/data/.m2/repository/org/apache/npanday/dotnet-model-configuration-appenders/1.5.0-incubating-SNAPSHOT/dotnet-model-confi
guration-appenders-1.5.0-incubating-SNAPSHOT.jar
[FATAL ERROR] Container realm = plexus.core
urls[0] = file:/E:/Data/Devtool/apache-maven-2.2.1/lib/maven-2.2.1-uber.jar
[INFO] ------------------------------------------------------------------------
[ERROR] FATAL ERROR
[INFO] ------------------------------------------------------------------------
[INFO] npanday.assembler.AssemblerContext.init(Lorg/apache/maven/project/MavenProject;)V
[INFO] ------------------------------------------------------------------------
[INFO] Trace
java.lang.NoSuchMethodError: npanday.assembler.AssemblerContext.init(Lorg/apache/maven/project/MavenProject;)V
at npanday.plugin.compile.ComponentInitializerMojo.execute(ComponentInitializerMojo.java:100)
at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:490)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(DefaultLifecycleExecutor.java:694)