How did you get this input?

given;
123641232132364123212332364123212221
it should only return the position of the first element of the plateau expected:<{pos=[3,7,10], peaks=[6,3,2]}> but was:<{pos=[3,7], peaks=[6,3]}>
why pos 10 and peak 2?

My code runs fine on my compiler, when i compiled on this app it says this error on stacktrace in random test
java.util.NoSuchElementException
at java.base/java.util.ArrayList$Itr.next(ArrayList.java:999)
at java.base/java.util.Collections.max(Collections.java:672)
at Kata.high(Kata.java:30)
at SolutionTest.randomTests(SolutionTest.java:33)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566) and more......................................