Build.gradle double signing (signing plugin)

I have the following build.gradle file with a signing plugin

BUT the resulting files should be
core-asyncserver-2.0-developer.jar
core-asyncserver-2.0-developer.jar.asc
core-asyncserver-2.0-developer.jar.md5
core-asyncserver-2.0-developer.jar.sha1

BUT instead there are 2 more files as well as it seems the *.asc files are being signed too after they are generated so I also end up with these 2 files
core-asyncserver-2.0-developer.jar.asc.md5
core-asyncserver-2.0-developer.jar.asc.sha1

This project only compiles on jdk8 right now, and I run ./gradlew clean release -x javadoc (also, on a side note, I ended up with core-asyncserver-2.0-developer-javadoc.jar which is funny since I ran with -x javadoc).

The gradle version is defined in that project with the gradle wrapper. Anyone know why it’s signing the asc files?