The Method Summary section contains various tabs that will filter the methods by the appropriate criteria. In the Default Methods tab, however, both default methods and static methods are included.

For example, see java.util.List:

https://docs.oracle.com/javase/9/docs/api/java/util/List.html

http://download.java.net/java/jdk10/docs/api/java/util/List.html

This seems to occur in both JDK 9 and current JDK 10 (build 36).

(It would probably be wise to audit the other tabs in the Method Summary and also in the other summary sections, if they have tabs.)